Prevent bots being added to currency table

Fix Bug #1261. Prevent bots being added to currency table. With bots
having random UUID every time they restart, this soon would get out of
hand with trash data.
Removed uneeded LINUX conditional around LSLFload operators  It causes errors on Mono compiles.
Updated Texture Fetching to handle bytes=start- and bytes=-end which the newer viewers will send.
Merge pull request #167 from mdickson/master

Removed uneeded LINUX conditional around LSLFload operators  It causes e...
Merge pull request #160 from AliciaRaven/BugFix_StopBotBank

Prevent bots being added to currency table
Merge pull request #1 from aurora-sim/master

Pulling latest code from AuroraSim