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- 'system' and 'OS' have different meaning now
  'system' defaults to a string derived from the Linux distribution
  (like rhel7) or on Mac to the macOS version (like macOS10.14)
- OS is equivalent to the output of 'uname -s'
- move dynamically created functions to new library libpbuild_dyn.bash
- do not set defaults in libpbuild.bash
- use the string returned by std::get_os_release() as system string
  if not passed as argument
-

- requires BASH >= 4 (associative arrays)
- pbuild::set_unpack_dir() added
- required changes to pbuild::prep() implemented

- option '--all-variants' is not required any more, a version can be passed
  as regex
- supress output from un-tar, configure, compile and install if not in
  verbose mode
- option '--enable-cleanup' added
- remove src directory after successful build by default
- an equal sign ('=') may prepend a version number passed as argument
- various fixes
- issue with using 'pbuild::use_{autotools,cmake}' outside a "prep"-
  function fixed
- installing depending shared libs improved
- abort if a target fails

- create prefix directory after compilation succeeded
- path to 'true(1)' fixed

- option '--all-variants' added, if this option is set, all variants matching
  the given version(s) will be build
- the build-system uses the release specified in the variants file. If a
  dependency have an improper release, the build stops
- the library is now better isolated from the "main" programm.
- several variables and function have been refactored

If the release of a module is set to 'removed', modbuild checks whether
the module is still available and removes it if yes.

bug fixed in function pbuild::module_is_avail(): set 'uvar' to '__unused__'
if second argument is empty/unset

- supported_os() renamed to supported_systems(), check is done in make_all
- supported_compilers() removed, obsolete since all variants must be defined in the variants-file
- set_download_url() cannot be used to pass SHA256 sums
- set_sha256sum() added

- more general concept of systems implemented, replacing OS specific stuff
- bugfix in 'install_pmodules_files()'
- install modulefile and release file together

- specifying a variants file has been replaced by a more flexible 'flavor' implementation
- 'ModuleGroup' has been renamed to 'GROUP'
- bugfix in setting 'PREFIX'
- a variants file must exist
- '--with' arguments are used to select a variant only not to load a module
- a SHA256 hash-sum can now be passed as second argument to set_download_url()
- a (relative) output file-name can now be passed as third argument to set_download_url()
- '{set,add}_docfile*()' have been replaced by 'install_docfiles()'
- build dependencies are now written to the doc-directory
- build script and variants file are installed in doc-directory

- install modulefile to doc-dir
- make sure BUILD_DIR exist

- auto-detect whether to use autotools or CMake
- pbuild::use_autotools() and pbuild::use_cmake() added, with these function you can select the to be used configuration tool if script for both are provided

make 'pbuild::add_patch_' usable; move initialisation of environment for bootsstraping to 'modbuild'

function 'pbuild::{pre_,post_,}build' renamed to 'pbuild::{pre_,post_,}compile'; master build function refactored

Pmodules/libpbuild.bash: fixes in get_source(), modulefile installation can be forced via command-line

- derive source file name from source URL

- bug in pbuild::cleanup() fixed

- source/build directory changed to "${PMODULES_TMPDIR}/{src,build}/$P-$V"
- function to find/download sources rewritten, specifing SOURCE_URL in
  build block is now required.
- we now have pre_ and post_ function for all build stages

- OS dependent build configuration is now in 'modbuild.conf'
- set PATH before sourcing 'modbuild.conf'
- installation path of modulefile fixed
- go through all build steps if nothing else is specified on command line

- modulesfile-templates are not used any more

- search_variante_file(): set 'variants_file' to empty string if none found
- load_build_dependencies():
  * here we don't have to look for a variants file  any more
  * bugfix in testing prefix 'b:' and 'r:' for build- or runtime dependency