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Resolve "port/cherry-pick changes from version 1.0.0 to master"

Closes #178

See merge request !151

- Issue #176, MR !149 relocatable modulecmd
- Issue #175, MR !148 new logmessage format
- Issue #173, MR !146 additional dirs in search path of CMake and pkgconfig
- Issue #172, MR !145: fix in reading legacy variants files

Resolve "overlay implementation"

Closes #32

See merge request !2

Resolve "modulecmd: sub-cmd whatis and keyword are broken"

Closes #168

See merge request !144

Resolve "add Springdale as RHEL clone"

Closes #171

See merge request !143

Merge branch '32-overlay-implementation' of gitlab.psi.ch:Pmodules/src into 32-overlay-implementation

If 'Version' is set in the calling shell, initialisation might be
skipped.

Merge branch '32-overlay-implementation' of gitlab.psi.ch:Pmodules/src into 32-overlay-implementation

another big change is the re-ordering of the public pbuild:: functions

Resolve "modulecmd: sub-cmd whatis and keyword are broken"

See merge request !141