make LilyPond name configurable
Merge pull request #298 from PeterBjuhr/master

help text for musicxml import updated
improve page formatting; no code format for GUI options, use lists
dont save a setting using the index of a combobox

later the items might change order. always save a real name
little gui cleanup
use same settings group, use lower case settings names
make remove trailing whitespace a separate function
new action to remove trailing whitespace
rename preview/debug modes to layoutcontrol

We now have instances of preview_mode and debug
against the user interface of Layout Control

This commit moves the files from preview_mode to layoutcontrol
and renames all references in ths source files
(at least those that caused runtime exceptions).
add cursortools.DocumentString and have Editor use it
let remove trailing whitespace use the new cursortools.DocumentString
allow cursor as slice
dont store edits to insert the empty string
move reformat to cursortools.Document instead of Editor (rename DocumentString to Document)
remove cursortools.Editor, keep Writer doing it all
Merge pull request #302 from uliska/rename-preview-mode

rename preview/debug modes to layoutcontrol
fix #301
Merge branch 'master' of github.com:wbsoft/frescobaldi
carefully test if you rename modules :-) or just grep
small nl tr upd
update of woodwind definitions, Issue #289