Fix define position for guile 2
Merge branch 'master' of ssh://git.sv.gnu.org/srv/git/denemo
Ensure display and dirty bit are updated after adding measures
Correct labels for rest insertion, add hide chord symbols command and bar numbering interval command
Define two symbols which appear to have no purpose, but have been mysteriously present and causing no problem until perhaps guile 2.0, although why they ever worked is a mystery
Drop unused modal code
Get rid of modal pref too