Fix warnings
Fix more warnings
update help message for /names
Print{,_attr} and server{,_attr} hooks were incorrectly handled when both
version existed (regular and attrs).  Specifically, the priority was not
respected, and both versions were run even when EAT_PLUGIN was returned.

Fixes #847.
Merge pull request #848 from orium/print-priority-847

Print{,_attr} and server{,_attr} hooks priority fix
Fix NAMES command syntax