Add support for a global "ethereal.conf" preferences file, stored in the

same directory as the "manuf" file ("/etc" or "/usr/local/etc", most
likely).

Add a mechanism to allow modules (e.g., dissectors) to register
preference values, which:

	can be put into the global or the user's preference file;

	can be set from the command line, with arguments to the "-o"
	flag;

	can be set from tabs in the "Preferences" dialog box.

Use that mechanism to register the "Decode IPv4 TOS field as DiffServ
field" variable for IP as a preference.

Stuff that still needs to be done:

	documenting the API for registering preferences;

	documenting the "-o" values in the man page (probably needs a
	flag similar to "-G", and a Perl script to turn the output into
	documentation as is done with the list of field);

	handling error checking for numeric values (range checking,
	making sure that if the user changes the variable from the GUI
	they change it to a valid numeric value);

	using the callbacks to, for example, update the display when
	preferences are changed (could be expensive);

	panic if the user specifies a numeric value with a base other
	than 10, 8, or 16.

We may also want to clean up the existing wired-in preferences not to
take effect the instant you tweak the widget, and to add an "Apply"
button to the "Preferences" dialog.

svn path=/trunk/; revision=2117

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