Add global level limits
Fix logical bug in getCondorStatus
Make getCondorQ and getCondorStatus more flexible
Merge branch 'v3/5579' into v3/5579_v2
Consider FE and global limits, when calculting the requests. Query the user collector three times instead of just once, but request the absolute minimum number of attributes, to keep it lightweight
Fix typos
Merge branch 'v3/5579' into v3/5579_v2

Conflict solved by manually applying the patch bits:
	frontend/glideinFrontendElement.py
Fix missing merge pieces
Add documentation for group.config.idle_vms_total (introducted in this branch),
as well as group.config.running_glideins_total (for which the code was added long ago).

The explanation of the whole group.config section was rewritten to make it more clear.
Correcting minor doc problems
Add documentation about the global config section
get_condor_status now always returns the same result, even in case of failure
Add a little better text in the documentation
Clarify test in the global section
Code quality improvements and using min() in a good way
Merge remote-tracking branch 'origin/v3/5579_v2' into branch_v3_2