Updated status file according to full module list

Full list is taken from https://docs.python.org/2/library/.
Changed `convertenviron` method signature.

Added optional dictionary object argument to work with. If NULL
it will be created (default behaviour).
Added `reload_environ` method to `posix` module.
Reloading environment after `zfork()` call.

Could be done with pure C. Will be replaced eventually.
Updated status document