[MacPorts] #45670: InsightToolkit31{2, 4}: retire old series 3.x version

[MacPorts]

#45670: InsightToolkit31{2,4}: retire old series 3.x version
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 Reporter:  petr@…       |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  InsightToolkit312 InsightToolkit314
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 I believe that the ports `InsightToolkit312` and `InsightToolkit314`,
 which provide older versions of `InsightToolkit`, should be discontinues.
 All versions date back to 2009:

 * Release 3.16 (September 15 2009)
 * Release 3.14 (May 28 2009)
 * Release 3.12 (March 1 2009)

 So we should keep only the latest one and eventually update. The other
 ports should be `replaced_by InsightToolkit`.

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Ticket URL: <https://trac.macports.org/ticket/45670>
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