Update list for Metamill

Metamill 7.0 changelog from December 1, 2015

UML 2.4, ADA 2005 round-trip

Metamill 6.2 changelog from February 11, 2014

Large data improvement, cancel button, timing diagram scaling fix, c/c++ fixes

Metamill 6.1 changelog from October 27, 2012

Element alignment, improved .mdl import, c/c++ fixes

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