0.9.21

Thanks to the efforts of several people, a lot has been improved in this release. Please see the github history for details as there are far too many to list.

Unfortunately, the automatically generated .zip and .tar.gz files that github generates don't include sub-modules. So please use the edb-debugger-0.9.21.tgz tarball that I've attached, which should have included all submodules needed for compilation.

Enjoy everyone!