adsense_injector 6.x-2.7

- we skip 6.x-2.6 final release as sync with that of 5.x.
- reset system weight. (#123972: Adsense Injector and paging)
- simplify legacy _adsense_injector_count_words().
- simplify legacy _adsense_injector_minwords_cfg().
- bugfix ultra long variable name (admin setting need reset). (#174705: Modify node type configuration storage to use a serialized collection stored in one variable rather than long variable names)
- remove fancy notice if no node type selected.
- bugfix list view based on previous code cleanup.
- cleanup variable names (admin setting need reset).
- default templates with new AdSense tag style.
- remove redundancy adsense module checking.
- adsense_injector_nodeapi() revamp for simpler programming logic.
- completely upgrade and port to D6.
- version number starting with 2.6 (sync with D5).
- tested with adsense 6.x-1.0-beta3.
- renew hook_menu(). D6 coming with new implementation.
- watchdog() no longer require for t().
- hook_nodeapi() coming with new implementation for D6.
- split admin related hook_settings() to adsense_injector.admin.inc.
- retouch adsense_injector.info so group this module with Adsense.
- coding style cleanup.
- validate code with coder module.
- add more documentation.
- clean up license and developer information.
- document project owner and co-maintainer.
- remove legacy admin setting paypal banner.
- remove legacy _dbg().