Merge branch 'jcome/dialogs'

* dialogs:
  Use files instead of documents for file filters of import dialog
  Typo and remove unwork code.
  Add a file type selector to save file dialog.
  Enable Open History Button by default.
  Reposition open history and cancel buttons
  Add file filters for open file dialog.
  Better wording and add mime for audio and images
  Use rename filter Valid files to Supported files according to the input by Dave Jeffery
  Add file filters into import dialog
  Use Import instead of Import Image, since we can import other formats too.
  Don't specify "Image" in title of importer since it supportis sif too.
Remove cvs dependency from linux build script
Remove cvs dependency
Retitle save as dialog
Update palette file save and open dialog. Ane improve canvas window save file dialog