onTradeAccept event

Now is fine :)
doRelocate to lua
getSpectators to lua
fix
Fix bug where the first addEvent wouldn't be called sometimes

There seems to be an issue with m_lastEventTimerId 0, this is more of a
workaround than a fix.
Merge pull request #919 from raymondtfr/fix-spells

Fix spells
Set maxPlayers to 0 will allow infinite players
Merge pull request #924 from Shawak/master

Set maxPlayers to 0 will allow infinite players
Remove whitespace before xml tag in spells.xml
reserve/release script environment cleanup
Change if to assert in resetScriptEnv

m_scriptEnvIndex should never be negative when calling resetScriptEnv.
Fix bug with the assert statement in getScriptEnv
Fix bug with cloned containers

Now they weigh what they are supposed to.
Add optional safety checks for addEvent
Stupid requirement
Merge pull request #931 from dalkon/master

Add optional safety checks for addEvent
Small updates and aditions to items.xml
More fixes and aditions
Merge pull request #932 from EPuncker/master

Small updates and aditions to items.xml
Small improvment to isPremium function