Setting context properties from with container
Chnge group bracket to square
add a vary basic plaintext() method that returns a text value for the node (e.g. string or markup)
new method defaultfilename
(use only when there is no filename yet)
provide a default filename (implement and close #472)
Merge branch 'master' of github.com:wbsoft/frescobaldi
the fields are only specified in one place
handle \\concat correctly
update chlog
open default viewer upon successful compile

implement and close #435
upd chlog
convert-ly: improve diff highlighting, dont apply dialog when clicking save button
close #436
Don't disable Copy global path button after use #470
Consistent syntax
Merge pull request #496 from PeterBjuhr/sessions

Sessions - minor edits
Fix double dot in default filename

ly.lex.extensions items already contain the dot, so
it doesn't have to be concatenated explicitly.

Closes #472
Merge pull request #498 from wbsoft/ul/fix-default-filename

Fix double dot in default filename
Merge pull request #495 from PeterBjuhr/musicxml

Musicxml Export wip