[PATCH V2] splicemap: support paths with spaces in splicemap (issue3844)

[Szymon Wróblewski]

> Will this work without posix mode? The posix flag here was introduced
> in Python 2.6 and we need to work on 2.4.

It was introduced in 2.6 only for split function, shlex class had it
already in 2.4.
Moreover Kevin Bullock suggested, that parsing should work in posix
mode, as it's used that way in filemap.