* Transformed std.c.linux.* into wrappers around core.sys.posix modules where appropriate.
* Added std.c.osx as the OSX equivalent of std.c.linux.
* Added std.c.osx.socket for OSX-specific socket declarations not covered by the Posix spec.
* Altered all makefiles to zip, etc, the new std.c.osx package.
-- add std.getopt
-- add std.variant
-- switch strings over to be invariant rather than const
-- hopefully the last big linux makefile overhaul
-- fix for bug 1579: write[ln] fails for obj.toString()
-- fix negative precision handling in std.format
-- add some file and directory iterator helpers
-- among other little changes here and there...