remove redundant calls to reaverageVoxelColors() now only use recursion unwinding
add shortcut key for Kill Local Voxels to help debugging of LOD
rename server's VoxelTree and make it a color reaveragging tree
Merge pull request #508 from ZappoMan/color_reaveraging

Color reaveraging fixes
fix several delete/delete[] mismatches
Merge pull request #509 from ZappoMan/bug_fixes

fix several delete/delete[] mismatches