Fix stupid compiler warning on unused wariable.
Use the new constants in various place.
Remove unecessary variable.
Remove MAX_PLAYERS define assocaited to get_players.
Fix definitively unused variable warning.
Fix redefinition of constant.
Fix some typos and possible bugs.
Fix another potantial bug.
Merge pull request #73 from Arkshine/maxclients

Add some generic constants - part 2