partial fix for #33726: avoid wrong partnames with SATB closed score

due to the '/' in the partname "Soprano/Alto" and "Tenor/Bass", partnames get
truncated to which leads to part names of "Alto" and "Bass".
Change the offedning "/" to "+" in the templates.
See http://musescore.org/en/node/33726#comment-142726
allow cross staff move for selections & rests
fix #37506: fix rendering of rootless slash chords
Merge pull request #1405 from MarcSabatella/37506-partial-slash-chord

fix #37506: fix rendering of rootless slash chords
Merge pull request #1402 from MarcSabatella/staffmove

allow cross staff move for selections & rests
Merge pull request #1400 from Jojo-Schmitz/templates

  partial fix for #33726: avoid wrong partnames with SATB closed score
Revert "  partial fix for #33726: avoid wrong partnames with SATB closed score"
Merge pull request #1406 from musescore/revert-1400-templates

Revert "  partial fix for #33726: avoid wrong partnames with SATB closed...
fix #36256: layout shift due to courtesy elements
Merge pull request #1407 from MarcSabatella/36256-layout-shift

fix #36256: layout shift due to courtesy elements
update mtest
try to reduce memory pressure on travis server
split Free font resource file