chanserv/op: Fix uninitialized variable usage introduced in e366228541

CID: 1238961
backend/opensex: Fix uninitialized variable usage introduced in c848333263

CID: 1238960
libathemecore/help: Fix memory leak when a help file cannot be opened

CID: 1238966
libathemecore/connection: Fix memory leak when connect() fails

CID: 1238964
libathemecore/conf: Fix crash when receive_pass or send_pass does not exist, introduced in 25a1f71c44

CID: 1238965 and 1238967
Merge pull request #388 from attilamolnar/master+coverity-fix

Fixes for bugs discovered by Coverity Scan
gs/set_groupname: do something more than just renaming a group to itself
gs/set_groupname: actually check access

In fact, require group founder access rather than just SET.
atheme 7.2.0-beta2.