[MacPorts] #42075: update py-chaco and related enthought ports

[MacPorts]

#42075: update py-chaco and related enthought ports
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 Reporter:  jjstickel@…  |      Owner:  macports-tickets@…
     Type:  update       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:  2.2.1
 Keywords:  maintainer   |       Port:  py-chaco py-enable py-blockcanvas
  haspatch               |  py-etsdevtools py-scimath
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 Patches to update py-chaco, py-enable, py-blockcanvas, py-etsdevtools, and
 py-scimath to current release versions will be attached.

 Documentation for these are sparse, but from what I can tell, wx or qt4 is
 needed as a backend for py-enable (similar to py-pyface). I have copied
 over the relevant variant lines from the py-pyface portfile. As wx is
 still not working well, pyqt4 or pyside are currently the options. Also,
 it seems that the existing patches are not longer needed.

 I have tested basic functionality by importing the modules in a python
 shell and plotting something via chaco.

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Ticket URL: <https://trac.macports.org/ticket/42075>
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