Merge fixes added to master into experimental

Modified wildcard for FileDialog to add an choice to show All Files

preview zoom by key

zoom big preview by shift + key

Minor fixes

Made lines starting with $ pass through

Made greetings configurable (no longer just 'start')

Fix some translation strings and update translations

Handle exceptions raised when printer is disconnected 

OS X pre-lion comes with readline preinstalled in the system python.

changed console window log hiding pattern logic to avoid memory leaking and newlines separating from lines to be hidden

Italian translation