GXemul Code2

Minor clarification of debug vs non-debug vs release.

Moving all thirdparty header files to src/include/thirdparty/.

Removing the userland emulation feature completely (since it was never really implemented).

Make sure that the documentation etc. are in synch before making a release.

Documentation updates.

Adding the new machine and component documentation.

Adding tail.html (for automated documentation creation).

Adding head.html (for automated documentation creation).

Ooops. Forgot to add CommandInterpreter.cc

Ooops. Forgot to add exec_elf.h.