tntdb-1.4-bp155.2.12

- Update to version 1.4 (see
  https://github.com/maekitalo/tntdb/compare/1.3...1.4
  for a changelog)
- Refreshed tntdb-1.3-avoid-version.patch as
  tntdb-1.4-avoid-version.patch
- Spec cleanup

- BuildRequires postgresql-server-devel on Leap >= 15.2 as well

- Add the missing build dependency for Tumbleweed.
- Run spec-cleaner

- Remove unused gnutls/openssl from buildrequires

- Update licensing information

- Remove empty package
- Build documentation

- better package structure

- Updated to version 1.3 of the package

- Updated to version 1.2 of the package

- Packaged version 1.1 of the package