Do a pass to identify and delete dead functions

[cpeel]

@srjfoo identified that abort_if_not_manager() in tools/project_manager/projectmgr.inc is never used. There are probably other functions that aren't either and are dead code. We should do a pass to detect and remove obviously-unused code. Note that we need to check against the noncvs repo as well but if it's only used there it should probably be moved into that repo.

This effort doesn't have to be perfect.