Changing back to MiniTest::Unit::TestCase because this is the version supported by our embedded ruby build on Windows

@axelstudios can we update our 32 bit embedded Ruby to p481 for the release?  Then we can switch back to Minitest::Test

MiniTest::Unit::TestCase is now Minitest::Test
Disabling failing ISO model test
Fixing long standing bug in AnalysisRecord
Merge remote-tracking branch 'remotes/origin/develop' into MeasureImprovements