Bug #3555 - switched to fixed/partitionable for slots_layout, and implemented a dynamically generated startd shutdown expression based on the number of slots.
Merge branch 'branch_master_3555' into master_2905

Conflicts:
	creation/lib/cgWParamDict.py
	creation/web_base/condor_startup.sh
	creation/web_base/glidein_startup.sh
	doc/factory/configuration.html
Checksum files for v3_1_alpha2