environment: Call unset-os-env when passed an ``f``. Fixes #794.
core-foundation.strings: faster CF>string.
unix: use byte-vectors here.
gdbm: Change the gdbm test file to have a different name on 32/64 bit. Fixes #673 and the race condition when running two mason instances on 32/64 bit.
cocoa.messages: use ERROR:.
cocoa.messages: some support for runtime message sending.
ui.backend.cocoa.views: maybe this works on 10.6.
ui.backend.cocoa.views: simplify and add os version check.
Config.macosx: Try to support 10.5.