0.2.3
 * PIP install now works
 * Cell merging and unmerging added

0.2.2
 * Fixed bug switching tables
 * Menubar icons added
 * Internationalization preparation (po file is available)

0.2.1
 * Format menu added
 * Printing bug (first line not printed) fixed
 * GPG key choice dialog added
 * Secret key generation dialog added
 * Password saving in pyspreadrc is now optional
 * Preferences dialog entries are now validated
 * Toolbar positions are now saved on exit
 * Absolute addressing with mouse changed to <Shift> + <Ctrl>
 * Relative addressing with mouse changed to <Alt> + <Ctrl>
