Provide method of storing joint indices sep from weight data for faster runtime processing.

SL-333 work - attachment joints now get a valid mJointNum, more checking on valid joint num values. Also reduced log spam slightly.

replace llinfos, lldebugs, etc with new LL_INFOS(), LL_DEBUGS(), etc.

Cleaned up a couple of things that the windows compiler was warning about, with our inheritance structure

Fixed crashes on login.  Moved most of the remaining character/skeleton generation code into llappearance.   Moved non-rendering related LLViewerJoint functionality into LLAvatarJoint.

Moved over the necessary classes to llappearance to support the loading of the
avatar's structure & params from file.