onTradeAccept event

Now is fine :)
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
removed parentheses
Merge pull request #933 from EPuncker/master

Small improvment to isPremium function
Fix crash when trying to remove inexistent node in WildcardTree

Fixes #935
Fix #926
Fix in onTradeAccept

If return false trade will be canceled
Merge pull request #894 from djayk1/master

onTradeAccept event
Change return type of internalCloseTrade from bool to void