Stable maintenance release.

* Fix a bug regarding wrong exit code on success.
* Fix build failure without custom_post_process module.

Stable feature release.

* Add "defines" and "pretty-only" format specifications to the --print
option.
* Add option --defines-from to accept override specifications from a
text file.
* Add option --changed to skip unchanged fields while printing.
* Fall back to hex-dump when pretty-printing unknown fields.
* Fix a bug where unknown fields were not transferred from the input
to the output map.
* Fix an unlikely crash when printing a field without a known
description string.
* Update submodule reference to forked libcintelhex snapshot, to
incorporate a segfault fix while auto-detecing the format of an
invalid ihex file (without colons and therefore no records at all).

Stable feature release.

* Add facility to implement custom post-processors on the output image
  data, with the ability to further modify contained fields.
* Implement an example post-processor to calculate and store a CRC
  checksum over the binary data.

Stable maintenance release.

* Routinely updated some build system components.
* Update documentation about libelf implementations.

Stable maintenance release.

* Minor fix to the build system related to cross-compilation.

Stable feature release.

* Factor out an independent utility `lpstrings` to be used directly on
  supported binary data images, without the need for an ELF map.
* Small fixes around string search results output.

Stable maintenance release.

* Minor updates to the build system and documentation.
* Fixed author e-mail address in all source files.

Stable bug-fix release.

* Better safety checks for field transfer from old to new layout.

Stable bug-fix release.

* Updated dependency for libcintelhex version (included), fixing a
  segmentation fault.
* No changes in elf-mangle's own code.

Stable bug-fix release with documentation updates.

* Updated dependency for libcintelhex version (included).
* Fixes problems with raw or ihex image files on Windows.
* More complete German translation.
* Additional and revised documentation, now installed with the
  program.