Added a section on adding a new lexer and testing it.
* Fixed broken sourcode directives.
Simplified adding and testing a new lexer by referring to the Makefile.
* Added example for JCL option comment.
Improved heuristic for guessing Rexx from text.
Fixed EasyTrieve lexer, which is now case sensitive and expects keywords in upper case.
Merged birkenfeld/pygments-main into default
Added EasyTrieve 'not' operator.