Added "region set" console command for runtime adjustement of agent-limit and max-agent-limit
This is primarily for Nebadon since we needed it for some console testing but I thought I would write it up publicly.
I have just added a "region set" console command to master branch (and ghosts). This allows one to set the following
parameters whilst OpenSimulator is running
agent-limit <int>. Current agent limit. More typically this is set via the viewer's region/estate dialog. However,
some viewers hard-code an upper bound of 100 at the moment. This is persisted over simulator restart.
max-agent-limit <int>. The max agent-limit that can be set. This was already settable via the MaxAgents parameter in a
regions config file but this allows one to do it dynamically. I believe this parameter is primarily used by simulator
operators to stop the viewer setting agent-limit above a given number. Unfortunately, when set here it will not
currently persist over server restart. For this to happen it must be separate set as MaxAgents in the region config file.