Add global stylesheet with 'mBreak' command defined

The mBreak command allows a \break to be inserted in a document where there is a break in the source manuscript (on paper). It will be disabled before the final release.
Disable auto line breaks
rename 'main' folder to 'cplScores' (for completeScores)
Update .gitignore
add '\mBreak's to Voice A (for line breaks in manuscript)
replace spacer rests with proper (rX) rests
set ragged-last property to ##t
add final barlines

note that currently a final barline is appearing after bar one (when voices B to E end); this may be fixed later using a Scheme function
add np++ workspaces (and case fix in np++session)
done voice B
update log