added "include" functionality

- added functionality to "include" files
- split TParser.parseMain() into TParser.parseMain() and TParser.parseCurrentFile() to allow parsing without adding "main"-specific parts


@Bruce: append  __?w=1__ to the url when looking at the changes (this hides the whitespace-changes as you  include unneeded tabs each time :D)

in this case: https://github.com/GWRon/bcc/commit/292de0a29c2332c48b6d516c365399a23c97e70e?w=1