1.31.2 (unstable):

* Fix crash when loading images into an image field.
  (Murray Cumming)
* Fix crash caused by assert in recent versions of libevince-view.
  (Murray Cumming) Bug #761396 (m.rick.mac))
* Really forget a table when removing it.
  (Murray Cumming) Bug #754645 (m.rick.mac)
* Table deletion: Actually let the user cancel the dialog.
  (Murray Cumming)
* Initialize PostgresSQL database with the C locale.
  Because using the current locale seems arbitrary and useless to other users.
  (Murray Cumming) Bug #761372 (m.rick.mac)
* Try to catch filesystem errors sooner.
  (Murray Cumming) Bug #761373 (m.rick.mac)
* Details layout: Allow notebooks at top-level.
  (Murray Cumming) Bug #759511 (m.rick.mac)
* Connection to central server:
  - Ask again if the connection fails.
  (Murray Cumming)
  - Specify a timeout.
  (Murray Cumming)

Build:
* Check for, and require, C++14.
* Lots of modernization of the C++ source code.