lib: internal: nativeresolver: verifyElement: small speed-up: use getFamilyPackageEntry()
lib: config: option 'cupt::resolver::max-solution-count': increased default value from 512 to 8192
lib: internal: nativeresolver: solution: refactoring: new method 'setEmpty'
lib: internal: nativeresolver: solution: refactoring: 'getFamilyPackageEntry' and 'setPackageEntry' are now private