Bugfix [#34012] Skeleton Sketching settings unclear

Although the bug report here wasn't exactly clear about what exactly was wrong,
it soon became apparent that the UI stuff here was in need of some love.

Changes:
* Ported over missing tooltips from 2.49 (i.e. most of them)
* Fixed a few incorrect tooltips (mostly the subdivision length settings)
* Made the autonaming and number/side settings slightly clearer - number/side
are used to replace placeholders in the names of template bones (&N and &S
respectively) when autonaming is disabled. When it is enabled, these values are
determined automatically.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@54168 954f8c5b-7b00-dc11-b283-0030488c597c