[MacPorts] #71711: portindex: allow thread count override via cmdline param and new macports.conf property

[MacPorts]

#71711: portindex: allow thread count override via cmdline param and new
macports.conf property
--------------------------+----------------------
  Reporter:  mascguy      |      Owner:  (none)
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:  2.10.5
Resolution:               |   Keywords:
      Port:  portindex    |
--------------------------+----------------------
Changes (by mascguy):

 * Attachment "portindex-timing-changes.diff" added.

 Changes to portindex, to provide timing info

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Ticket URL: <https://trac.macports.org/ticket/71711>
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