MEDIUM: Petri Graphs were no longer closeable
IMPORTANT: Fixed some issues with option pane dialog when dialog is very
big (OK/Cancel buttons were behind the dock bar).
RESOLVED - issue OPENFLEXO-839: impossible to select a folder to store
the generated doc 
https://bugs.openflexo.com/browse/OPENFLEXO-839
Fixed directory selection on MACOSX. Directory selection only works in
LOAD mode and not with SAVE.
RESOLVED - issue OPENFLEXO-839: impossible to select a folder to store
the generated doc 
https://bugs.openflexo.com/browse/OPENFLEXO-839
Removed needless property sets. These are automatically performed by the
FlexoFileChooser when setting the selection mode.