Remove _mesh field since the mesh data no longer needs to be stored after it's initially used.
Remove _mesh field since the mesh data no longer needs to be stored after it's initially used.

This may improve memory usage for regions using mesh and sculpts, though I suspect that it doesn't address the current memory leak.

RavenB/opensim,ft-/opensim-optimizations-wip-tests,Michelle-Argus/ArribasimExtract,justinccdev/opensim,BogusCurry/arribasim-dev,Michelle-Argus/ArribasimExtract,ft-/arribasim-dev-extras,ft-/arribasim-dev-extras,ft-/arribasim-dev-tests,rryk/omp-server,ft-/opensim-optimizations-wip-extras,BogusCurry/arribasim-dev,QuillLittlefeather/opensim-1,ft-/arribasim-dev-tests,M-O-S-E-S/opensim,justinccdev/opensim,bravelittlescientist/opensim-performance,BogusCurry/arribasim-dev,TomDataworks/opensim,TomDataworks/opensim,justinccdev/opensim,RavenB/opensim,bravelittlescientist/opensim-performance,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,rryk/omp-server,bravelittlescientist/opensim-performance,QuillLittlefeather/opensim-1,BogusCurry/arribasim-dev,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,ft-/opensim-optimizations-wip-extras,BogusCurry/arribasim-dev,ft-/opensim-optimizations-wip-tests,bravelittlescientist/opensim-performance,RavenB/opensim,OpenSimian/opensimulator,OpenSimian/opensimulator,M-O-S-E-S/opensim,ft-/opensim-optimizations-wip,bravelittlescientist/opensim-performance,Michelle-Argus/ArribasimExtract,ft-/opensim-optimizations-wip-extras,QuillLittlefeather/opensim-1,OpenSimian/opensimulator,RavenB/opensim,OpenSimian/opensimulator,OpenSimian/opensimulator,OpenSimian/opensimulator,rryk/omp-server,RavenB/opensim,rryk/omp-server,ft-/arribasim-dev-tests,BogusCurry/arribasim-dev,ft-/arribasim-dev-tests,justinccdev/opensim,ft-/arribasim-dev-extras,ft-/arribasim-dev-extras,ft-/opensim-optimizations-wip,justinccdev/opensim,Michelle-Argus/ArribasimExtract,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,TomDataworks/opensim,ft-/arribasim-dev-tests,Michelle-Argus/ArribasimExtract,TomDataworks/opensim,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,ft-/arribasim-dev-extras,RavenB/opensim,QuillLittlefeather/opensim-1,bravelittlescientist/opensim-performance,rryk/omp-server,RavenB/opensim,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,ft-/opensim-optimizations-wip-tests,QuillLittlefeather/opensim-1,QuillLittlefeather/opensim-1,TomDataworks/opensim,ft-/opensim-optimizations-wip-tests,justinccdev/opensim,TomDataworks/opensim,ft-/opensim-optimizations-wip-extras,ft-/arribasim-dev-tests,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,M-O-S-E-S/opensim,TomDataworks/opensim,ft-/arribasim-dev-extras,M-O-S-E-S/opensim,ft-/opensim-optimizations-wip-tests,rryk/omp-server,ft-/opensim-optimizations-wip,M-O-S-E-S/opensim,Michelle-Argus/ArribasimExtract,M-O-S-E-S/opensim,ft-/opensim-optimizations-wip,EriHoss/OpenSim_0.8.2.0_Dev_LibLSLCC,QuillLittlefeather/opensim-1,OpenSimian/opensimulator,M-O-S-E-S/opensim,ft-/opensim-optimizations-wip-extras