Move lots of README's

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@1970 f38db490-d61c-443f-a65b-d21fe96a405b

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-GENERAL ENCHANCEMENTS TO EXTENSION LOGIC : 
-
-QUOTING: 
-
-exten => s,5,BackGround,blabla
-
-The parameter (blabla) can be quoted ("blabla"). In this case, a 
-comma does not terminate the field. 
-
-Also, characters special to variable substitution, expression evaluation, etc
-(see below), can be quoted. For example, to literally use a $ on the 
-string "$1231", quote it with a preceeding \. Special characters that must
-be quoted to be used, are [ ] $ " \. (to write \ itself, use \\). 
-
-VARIABLES: 
-
-Parameter strings can include variables. Variable names are arbitrary strings. 
-They are stored in the respective channel structure. 
-
-To set a variable to a particular value, do : 
-
-;exten => 1,2,SetVar,varname=value
-
-You can substitute the value of a variable everywhere using ${variablename}.
-For example, to stringwise append $lala to $blabla and store result in $koko, 
-do: 
-
-;exten => 1,2,SetVar,koko=${blabla}${lala}
-
-There are also the following special variables: 
-
-${CALLERID}	Caller ID
-${CALLERIDNAME}	Caller ID Name only
-${CALLERIDNUM}	Caller ID Number only
-${EXTEN}	Current extension
-${CONTEXT}      Current context
-${PRIORITY}	Current priority
-${CHANNEL}	Current channel name
-${ENV(VAR)}	Environmental variable VAR
-${LEN(VAR)}	String length of VAR (integer)
-${EPOCH}	Current unix style epoch
-${DATETIME}	Current date time in the format: YYYY-MM-DD_HH:MM:SS
-${TIMESTAMP}	Current date time in the format: YYYYMMDD-HHMMSS
-${UNIQUEID}	Current call unique identifier
-${DNID}         Dialed Number Identifier
-${RDNIS}        Redirected Dial Number ID Service
-${HANGUPCAUSE}	Hangup cause on last PRI hangup
-${ACCOUNTCODE}  Account code (if specified)
-
-${SIPDOMAIN}    SIP destination domain of an inbound call (if appropriate)
-
-There are two reference modes - reference by value and reference by name. 
-To refer to a variable with its name (as an argument to a function that 
-requires a variable), just write the name. To refer to the variable's value, 
-enclose it inside ${}. For example, SetVar takes as the first argument 
-(before the =) a variable name, so: 
-
-;exten => 1,2,SetVar,koko=lala
-;exten => 1,3,SetVar,${koko}=blabla
-
-stores to the variable "koko" the value "lala" and to variable "lala" the 
-value "blabla". 
-
-In fact, everything contained ${here} is just replaced with the value of 
-the variable "here". 
-
-EXPRESSIONS: 
-
-Everything contained inside a bracket pair prefixed by a $ (like $[this]) is 
-considered as an expression and it is evaluated. Evaluation works similar to 
-(but is done on a later stage than) variable substitution: the expression 
-(including the square brackets) is replaced by the result of the expression 
-evaluation. The arguments and operands of the expression MUST BE separated 
-with spaces (take care NOT to leave ANY spaces between opening and closing 
-square brackets and the first and last arguments). 
-
-For example, after the sequence: 
-
-exten => 1,1,SetVar,"lala=$[1 + 2]";
-exten => 1,2,SetVar,"koko=$[2 * ${lala}]";
-
-the value of variable koko is "6".
-
-Operators are listed below in order of increasing precedence.  Operators
-with equal precedence are grouped within { } symbols.
-
-     expr1 | expr2
-             Return the evaluation of expr1 if it is neither an empty string
-             nor zero; otherwise, returns the evaluation of expr2.
-
-     expr1 & expr2
-             Return the evaluation of expr1 if neither expression evaluates to
-             an empty string or zero; otherwise, returns zero.
-
-     expr1 {=, >, >=, <, <=, !=} expr2
-             Return the results of integer comparison if both arguments are
-             integers; otherwise, returns the results of string comparison
-             using the locale-specific collation sequence.  The result of each
-             comparison is 1 if the specified relation is true, or 0 if the
-             relation is false.
-
-     expr1 {+, -} expr2
-             Return the results of addition or subtraction of integer-valued
-             arguments.
-
-     expr1 {*, /, %} expr2
-             Return the results of multiplication, integer division, or
-             remainder of integer-valued arguments.
-
-     expr1 : expr2
-             The `:' operator matches expr1 against expr2, which must be a
-             regular expression.  The regular expression is anchored to the
-             beginning of  the string with an implicit `^'.
-
-             If the match succeeds and the pattern contains at least one regu-
-             lar expression subexpression `\(...\)', the string correspond-
-             ing to `\1' is returned; otherwise the matching operator
-             returns the number of characters matched.  If the match fails and
-             the pattern contains a regular expression subexpression the null
-             string is returned; otherwise 0.
-
-Parentheses are used for grouping in the usual manner.
-
-The parser must be parsed with bison (bison is REQUIRED - yacc cannot 
-produce pure parsers, which are reentrant) 
-
-CONDITIONALS
-
-There is one conditional operator - the conditional goto : 
-
-;exten => 1,2,gotoif,condition?label1:label2
-
-If condition is true go to label1, else go to label2. Labels are interpreted
-exactly as in the normal goto command.
-
-"condition" is just a string. If the string is empty or "0", the condition
-is considered to be false, if it's anything else, the condition is true. 
-This is designed to be used together with the expression syntax described 
-above, eg : 
-
-exten => 1,2,gotoif,$[${CALLERID} = 123456]?2|1:3|1
-
-
-Example of use : 
-
-exten => s,2,SetVar,"vara=1"
-exten => s,3,SetVar,"varb=$[${vara} + 2]"
-exten => s,4,SetVar,"varc=$[${varb} * 2]"
-exten => s,5,GotoIf,"$[${varc} = 6]?99|1:s|6";
-