[glom/glom-1-16] (26 commits) ...Merged from glom-1-14, hopefully with no losses.

[Murray Cumming <murrayc src gnome org>]

Summary of changes:

  3addd52... Explicitly link with libdl for Python module loading test (*)
  0c87ee5... Improve stderr message. (*)
  483c7ee... Spawn functions: Catch some exceptions. (*)
  de5b41e... In progress (*)
  fe44b0b... Add Save Backup menu item. (*)
  8efa33a... Save as Example: Reset the old file URI and allow auto-savi (*)
  281caea... Document: Avoid a crash when creating the parent directory. (*)
  fe55732... Improve backup saving and add backup restoring. (*)
  e111151... Show progress in the UI during backup saving and restoring. (*)
  f99ace4... PostgreSQL backups: Use .pgpass. (*)
  c197c88... PostgreSQL backups: Archive the directory in a .tar.gz.. (*)
  53c32d2... PostgresQL backups: Suggest a dated name. (*)
  05b16e1... Fixed warnings, even with the latest gtkmm-2.24. (*)
  9019f1b... Fixed warnings with latest gtkmm-2.24 (*)
  f4b6374... Saving from examples: Create the groups mentioned in the do (*)
  3d1cdf5... Saving from examples: Set the table privileges mentioned in (*)
  a7fb27a... Saving as example: Fix this. (*)
  8cc2f3b... Small Business example: Add table privileges. (*)
  c4b4683... Saving from a backup: Now works. (*)
  9b75d8a... DTD: Mention the startup_script node. (*)
  644a18a... Added Developer/Restore Backup menu item. (*)
  17423eb... Added --restore command-line option. (*)
  a3f7687... 1.14.4 (*)
  17dbb39... Allow unique fields with same name in multiple tables. (*)
  55b7296... 1.14.5 (*)
  4a21848... Merged from glom-1-14, hopefully with no losses.

(*) This commit already existed in another branch; no separate mail sent