Install documentation update

Pacman section updated to reflect the obsoleted status
OSG Client references and install section updated
manage-glidein description reformatted to be more similar to the rest of the documentation
Updated documentation, consistency, links, general updates

- Name is GlideinWMS
- Uniform component names (User Pool, WMS Pool, ...)
- HTCondor instead of Condor
- updated links to condor manual
- no more dead links
- more links to RPM installs
- Pacman no more available
- removed GCB section
- kept quill but did not check its validity/did not update

remaining TODO:
Is is there plan for a tarball installation of OSG Client via installer?

documentation.html:
Paper list in the documentation list.
Suggest an article for references to GlideinWMS

upgrade.html
Replace CVS with GIT commands?

pool_install.html:
does the “condor” command exists?
/path/to/condor/location/condor start
/path/to/condor/location/condor stop
replaced cvs command with git pull origin branch
Partial fix for monitoring issues (#5239) in v3 protocol with multiple proxies
1. Fix running glidein reported by factory.
2. Propagate credential id used used by glidein in the condor_startd classad
Add support for idle_vms_total limits in the frontend
Merge remote-tracking branch 'origin/v3/5519' into v3/5519_v2

Conflict resolved by applying the patch bits by hand:
	frontend/glideinFrontendElement.py
Add global level limits
Merge remote branch 'origin/branch_v3_2' into v3/5239

Conflicts:
	frontend/glideinFrontendLib.py
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
Improved Credential Class
The GLIDEIN_MaxMemMBs is used to set the total memory, so no need to use it again in the per-slot settings; rely on auto-splitting instead
Fix monitoring info in glideclient classad to work with v3 credetnial specific glideclient classads
Fixed code spacing from tab to spaces
Use all StarterLog files when parsing out which jobs were served