Integration of tabs, fixes for invalid URL's (which are supposed to always work).
Integration of tabs, fixes for invalid URL's (which are supposed to always work).

NOTE: there should be some way for included scripts to tell contentSystem{} if 
they will allow invalid URL's (i.e. URL's that have neither templates nor 
scripts).  Probably would be nice to specify whether a URL must have an end-point 
script, an end-point template, or both to be considered valid... 

/contentSystemClass.php:
	* MAIN:::
		-- NEW PROPERTY (protected): $tabs=NULL
	* initialize_locals():
		-- create a new cs_tabs{} object, and ensure it reports a version 
		matching it's own.
	* load_main_templates():
		-- always cd() back to the main "/templates" directory, so the proper 
		templates are checked.
		-- removed a strange bit of commented-out code... weird.
	* load_shared_templates():
		-- cd() back to the main "/templates" dir.

crazedsanity/cs-content,crazedsanity/cs-content