first Git-committed version of ranking interface
broken - does not show Meg's asignments
fixed broken assignment display
bug fix, conditional warning, and redo-all button
core functionality done
Merge branch 'master' into ranking

Conflicts:
	index.php

Merging in a bunch of changes from the main repository that occurred in parallel with my changes for ranking.
email to PC members with incomplete rankings
rank reminder mail template
changed ranking hint from offline.php to ranks.php
display ranks in contactlist
fixed null bug in rank count display
simplified display of rank count in contactlist
simplified display of rank count in index
enabled display of rank count in index even when no assigned reviews
changed unranked reminder email template to single message for all papers
calling framework for randwalk rank method
debug message
extract comparisons into redundant storage
complete but untested random-walk rank aggregation
added 1/n^3 convergence criteria for random walk