Remove headers from SquashUploader not handled correctly by my webhost.
Debug: For win32 builds, display fatal exception before waiting for input after a crash
Added: "Record Undo" option.

"Record Undo" is reset when loading or saving a level.
Long undo operations can be canceled.
Fixed: Missing/bugged plant and grass graphics on some systems.
Added: Undo Limit setting
Submodule pymclevel updated.

Submodule pymclevel:
    > cc28986 - Added: Block names for Minecraft 1.5
    > a97ce1c - mce.py: dumpsigns: Don't decode sign text now that TAG_String automatically decodes it.