[MacPorts] #29405: LyX: upgrade to 2.0.0

[MacPorts]

#29405: LyX: upgrade to 2.0.0
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 Reporter:  carsomyr@…          |       Owner:  snc@…           
     Type:  update              |      Status:  new             
 Priority:  Normal              |   Milestone:                  
Component:  ports               |     Version:  1.9.2           
 Keywords:  haspatch            |        Port:  LyX             
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Changes (by ryandesign@…):

  * keywords:  => haspatch
  * owner:  macports-tickets@… => snc@…
 * cc: snc@… (removed)


Comment:

 Should use xz distfile; it's smaller.

 md5 checksum should not be reinstated; md5 is obsolete.

 branch should be computed instead of being hardcoded; see
 [wiki:PortfileRecipes#branch].

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Ticket URL: <https://trac.macports.org/ticket/29405#comment:1>
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