Enable packaging of library using CPack.
Change mode of text file.
Fix build of threaded library on Unix by adding the appropriate link library.
Correct CPack package description file.
Set RPM generator specific variables.
Set RPM CPack variables already in CMakeList.txt.
Convert ChangeLog to format allowed in RPM spec.
Fix bugs in package configuration file.
Remove time fields from ChangeLog entries which are not compatible with RPM spec.
Add missing name to ChangeLog entry and further format changes.
Remove separating lines from ChangeLog again.
Add missing year to ChangeLog entry. RPM is now generated successfully.
Remove brief description from README to avoid duplicate appearance in RPM and other packages.
Change package vendor to just a name.
Set additional DEB CPack variables in package.cmake.in.
Use dpkg --print-architecture also for RPM generator.
Merge branch 'refs/heads/feature/cpack-package-generation' into develop