News in 1.13.2, 2024-08-29 (rc version)
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This is a development snapshot (release candidate version). The stable versions
will be the 1.14.x.

* Re-add support for installed unit tests.

Modernize a bit the codebase:
* License headers: follow the REUSE way of applying licenses, with SPDX tags.
* Convert #include guards to #pragma once

Small improvements:
* Rename config.h to gspell-config.h
* Update gconstructor.h
* Re-organize files within the repository: have tests/interactive-tests/ and
  tests/unit-tests/