build_helpers: Remove trailing slash that distutils on Windows hates
setup.py: Put README-style docs under the correct module
bin/meld: Add support for detecting frozen execution
bin/meld: Load libintl differently when frozen

If running from frozen, we'll use the exact libintl that we've
included with the binary.
meld.conf: Treat frozen installs differently as layouts will change
bin/meld: Treat gsettings as the same case for frozen and uninstalled