messages fix, add /manuclearp and /mangclearp
fix clear commands change mandemote and manpromote

dont make manpromote and mandemote act like manuadd when OP, 3 manuadd commands arent needed.
Update GroupManagerPermissions.java
add new commands, add alias to listgroups
add mising isopoverride check
fix alias
readd some checks
Merge pull request #371 from necrodoom/patch-72

add new commands and others
Fix loops.
More Necrodoom fixes.
another string fix.
Minor grammatical changes to config.yml
Merge pull request #452 from evonuts/groupmanager

Minor grammatical changes to config.yml
Merge remote-tracking branch 'origin/groupmanager' into 2.9