Regression test failures

[LiberalArtist]

I had a few regression test failures on OS X 10.10.4:

$ make regression | grep -v OK
(cd humdrum; /Applications/Xcode.app/Contents/Developer/usr/bin/make regression)
(cd toolkit-source/regression-tests; /Applications/Xcode.app/Contents/Developer/usr/bin/make -s verbose)
(cd humextra; /Applications/Xcode.app/Contents/Developer/usr/bin/make regression)
(cd example; /Applications/Xcode.app/Contents/Developer/usr/bin/make regression)
bin/run-command-tests 
chorck      test 001 FAILED Example with four rule violations
extractx    test 051 FAILED Extract from multiple segments
Option "debug" from definition:
    debug=b
is already defined in: 
    hum2abc     test 001 FAILED Converting a melody into ABC plus.
hum2muse    test 001 FAILED Measure the beat position of each point in the score.
Error: no elements in buffer to extract.
itemCount = -1
lofcog      test 001 FAILED Measure the center of gravity of a C Major scale.
notearray   test 001 FAILED Basic usage of the notearray program.
xml2hum     test 001 FAILED Convert a MusicXML file into a Humdrum file.