Replace MAX_AGENT_ATTACHMENTS with sim based response
Replace max groups with benefits based response
Upload costs are now handled by sim response
Removed no-longer-needed lleconomy files and classes
Removed dead fields from hippolimits and hippogridmanager
Also removed lame LL code that is redundant and silly
On non SL grids, when values are not provided for benefits, they will be
set to the values granting maximum liberty.
Old standardized responses still work when benefits aren't implemented.
