Core/Groups: More clean-up and corrections made to handler.

- corrected SMSG_PARTY_MEMBER_STATS Packet structure, over simplification
- to be pretty, gets the best of us, filled byteString and packet enum.

- Corrected someones assumption that flags do not include any PET_ updates

- Fixed some strings that were out of place.(switched around or random doubled)

- Shifted some handlers into more correct placement, DisbandGroup shouldn't
- be in middle of groupLoot or roll handling, and etc.
- easier to find it, if its grouped together right.(cosmetic)

- Remarked some of the error check code, nice to know what is in there JUST for
- deb, and what is for actual data.(cosmetic)

NOTE:
Needs further tested by those having lag and characters group range issues.
if this does not fix it, this will only leave the aura-handling to be re-addressed.

Signed-off-by: bootz <bootz@projectskyfire.org>