updating pymol to 2.1.0 and PyQt interface

[Jack Howarth]

Could someone please commit the proposed Portfile.diff and patches on the
ticket...

https://trac.macports.org/ticket/56139

which updates pymol to the current 2.1.0 release and adds the additional
dependencies required for the new PyQt based GUI? The packages notes on
installation that the legacy Tk based GUI can still be used by appending
'-N pmg_tk' when pymol is started on the command line.
              Thanks in advance.
                           Hacj
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