is forgiving about semi-numeric port numbers, and allows you to specify
a default port (default is -1, None returned for nonnumeric port).

hacks for Windows and DOS here already :-( ).

Avoid core dumps in resizestring().

Wonder if this will break it on all other platforms :-)

By Sjoerd.

to specify where it should go (if specified, even local files will be
copied into the given file).

Note that .pyc files are platform independent.

- Support ~[user] expansion.

- Remember last directory and pattern; optional 'key' argument
specifies different memory locations.

- Absolutify pathnames if possible.

- WM close event cancels the dialog.

- First arg to go() can be either a directory or a file (renamed to
dir_of_file); defaults to current directory.