Script creation and removal is asynchronous

[arthur00]

ScriptInstance creates and removes scripts using the AsyncCommandManager. If scripts with same UUID are quickly removed and recreated (e.g. quark crossings), race conditions occur. One in particular is recurring, timers:

4975-8016-cc6dbcd60e6d) in object DeadObject in artSCR1. Unable to load script state file ScriptEngines/b99c51c7-f425-4369-9894-77e7614baf27/8e0bcf78-8e25-46fb-8aee-8c2fb229c29d.state. XML is defaultTruetimer22000000000019999999720. Exception An element with the same key already exists in the dictionary. at System.Collections.Generic.Dictionary`2[System.String,OpenSim.Region.ScriptEngine.Shared.Api.Plugins.Timer+TimerInfo].Add (System.String key, OpenSim.Region.ScriptEngine.Shared.Api.Plugins.TimerInfo value) [0x00171] in /build/buildd/mono-2.10.8.1/mcs/class/corlib/System.Collections.Generic/Dictionary.cs:452
at OpenSim.Region.ScriptEngine.Shared.Api.Plugins.Timer.CreateFromData (UInt32 localID, UUID itemID, UUID objectID, System.Object[] data) [0x0005f] in /share/opensim/bld/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/Plugins/Timer.cs:185
at OpenSim.Region.ScriptEngine.Shared.Api.AsyncCommandManager.CreateFromData (IScriptEngine engine, UInt32 localID, UUID itemID, UUID hostID, System.Object[] data) [0x000df] in /share/opensim/bld/OpenSim/Region/ScriptEngine/Shared/Api/Implementation/AsyncCommandManager.cs:429
at OpenSim.Region.ScriptEngine.Shared.Instance.ScriptInstance.Load (System.AppDomain dom, System.String assembly, StateSource stateSource) [0x00409] in /share/opensim/bld/OpenSim/Region/ScriptEngine/Shared/Instance/ScriptInstance.cs:380