Launch options + drag and drop

Added drag and drop options, and made the app work even if current
directory was "wrong", i.e. made all file paths relative to the module
paths. Also added option to pass file paths through argv, and made the
application single instance (should probably be settings option). Added
info file with version, and added app name. Also made an batch file for
registering file types on windows (currently requires PYTHONPATH to be
set to work). At the moment it just registers hdf5, but more can easily
be added. Should probably make option / prompt for standard/minimal/all.