For stat names containing periods, replace with '#' rather than throw exception

In relation to http://opensimulator.org/mantis/view.php?id=7317
Make proper fix for last commit wrt Mantis 7317 by replacing disallowed c char and not literal 'c'
Fix regression from recent a02dae5 where stand positions are no longer correct when a sit target is specified.

Adjusts stand position using just avatar position relative to the root prim instead.
Fixes http://opensimulator.org/mantis/view.php?id=7315 and preserves previous fix for http://opensimulator.org/mantis/view.php?id=7299
Fix issues where setting llSetTextureAnim(FALSE... did not work properly).

I ended up amalgamating patches from http://opensimulator.org/mantis/view.php?id=7313 and http://opensimulator.org/mantis/view.php?id=7318
Thanks a lot to both bobshaffer2 and cinderblocks.
Add cinderblocks and bobshaffer2 to contributors.