[MacPorts] #56139: update to pymol 2.1.0 with PyQt interface support

[MacPorts]

#56139: update to pymol 2.1.0 with PyQt interface support
-----------------------+-------------------
 Reporter:  jwhowarth  |      Owner:
     Type:  update     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:
 Keywords:             |       Port:  pymol
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 The attached Portfile.diff allows the pymol 2.1.0 release to be built with
 its new PyQt support. A default x11 variant is added to the packaging to
 allow for the current build against X11/tk by default. The upstream code
 currently has two defects.

 1) The tkinter based modules aren't accessible under the PyQt interface as
 expected. However, upstream is still blindly loading those modules under
 the PyQt interface so, if tkinter isn't installed, non-fatal warnings will
 appear such as...

 No module named _tkinter
 Unable to initialize plugin 'remote_pdb_load'
 (pmg_tk.startup.remote_pdb_load).
 No module named _tkinter
 Unable to initialize plugin 'apbs_tools' (pmg_tk.startup.apbs_tools).

 2) Currently pymol will always use the PyQt interface if it can be found.
 This causes the x11 variant of pymol to fail to properly detect its GL
 support.

 I am posting this packaging so users can access it for testing and report
 any additional bugs to upsteam. Hopefully they will resolve the two issues
 noted above shortly.

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Ticket URL: <https://trac.macports.org/ticket/56139>
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