Bug fixes

Fix incompatibility problem with admin_menu 2.4; switch CSS/JS to refer to "admin-menu" id.

* fixes issues #223497 #223497

Adds:
* external configuration file
* per node overrides
* defaults to external config for embedded, local config for player
* more options for player config
* caching for config file

New feature: Url subpages (#179954: Wiki Edit Url enhancement)
Bugfix: Fixed #130632: Unique titles restrict over other node types.

fixed bug with 'slogan' and 'mission' text being obscured

Has these fixes.

- uniqueid so it works on PHP 4. This also fixes the rare occasion that multiple graphs have the same id.
- Setting inner background would not create a gradient.
- Fixed the help class from regression.

Has these fixes.

- uniqueid so it works on PHP 4. This also fixes the rare occasion that multiple graphs have the same id.
- Setting inner background would not create a gradient.
- Fixed the help class from regression.