Apostrophe beautification
PC conflict display: Don't include system administrators.

Conflicts cannot be entered for non-PC system administrators (except
for direct authorship), and since non-PC administrators aren't on the
PC, it is somewhat surprising to list them under 'PC conflicts.'

Then remove pcMembersAndAdmins(), which is otherwise unused.
Include contact tags in minicontacts.

Whoopsy; the autoassigner lost the 'Select "XXX" tag' links for PC
subgroups. Recover them. This problem was introduced in version 2.56
(the major refactoring release).
Avoid PHP warning.