Add ability to generate ASCII documentation from the TeX files.

These changes add the ability to run 'make asterisk.txt' just like the existing
'make asterisk.pdf' commands to generate a text document from the TeX files we
have in the doc/tex/ directory. I've also updated a few of the .tex files because
they weren't properly escaping certain characters so they would show up as Unicode
characters (like [U+021C]). Made changes to the configure scripts so it would
detect the catdvi program which is required to convert the .dvi file generated
by latex.

I've also added a few lines to the build_tools/prep_tarball script so that the
text documentation gets generated and added to future tarballs of Asterisk
releases.

(closes issue #17220)
Reported by: lmadsen
Patches: 
      asterisk.txt.patch uploaded by lmadsen (license 10)
      asterisk.txt.patch-v4 uploaded by pabelanger (license 224)
Tested by: lmadsen, pabelanger

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@258351 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 2 insertions, 2 deletions

diff --git a/doc/tex/ael.tex b/doc/tex/ael.tex
index c483947d8..be03c2bfb 100644
--- a/doc/tex/ael.tex
+++ b/doc/tex/ael.tex
@@ -128,7 +128,7 @@ section of extensions.conf.
 To reload extensions.ael, the following command can be issued at the
 CLI:
 
-    *CLI> ael reload
+    *CLI$>$ ael reload
 
 \section{Debugging}
 
@@ -735,7 +735,7 @@ of \$[ ] expressions.
 
 NOTE: These things are wrapped up in a \$[ ] expression: The while() test;
 the if() test; the middle expression in the for( x; y; z) statement
-(the y expression); Assignments - the right hand side, so a = b -> Set(a=\$[b])
+(the y expression); Assignments - the right hand side, so a = b -$>$ Set(a=\$[b])
 
 Writing to a dialplan function is treated the same as writing to a variable.