Saving files when closing the application

[szabgab]

When closing the application and there are still unsaved buffers provide better options:

Show the list of the unsaved buffers and the following buttons:

• Close without saving
• Cancel (which will stop the closing)
• Save (save those that have filenames, provide save-as option to those that have no filenames)

Maybe provide a window with checkboxes for each unsaved buffer so the user can select which one s/he wants to save and which one not.
(Similar to what gedit does).

[jquelin]

fixed somewhere between bug report and 0.29

padre now asks for each unsaved file whether to save or not, with a possibility to cancel closing.