beta1.sfos340/1.7.3

Changes

• Remove CHANGELOG.md and changelog-template.md (1482028, 128c415, 487048c)
• Clean up some obsolete stuff (#246).
• Fix a path in comment for SFOS ≥ 3.4.0 (9da465c)
• Overhaul README.md
• Overhaul spec file
• Overhaul Git tag format

Full changelog
1.7.2-1.sfos340regular...beta1.sfos340/1.7.3

Binary releases
A noarch RPM and a SRPM manually built with rpmbuild are attached.

_{Always mind to create release tags in the corresponding release branch, not the master or qcrypto branch!}