Update KDE min version to 4.8.0 (for nepomuk/datamanagement.h)
Update KDE min version to 4.8.0 (for nepomuk/datamanagement.h)

leonhandreke/ktp-common-internals,leonhandreke/ktp-common-internals,KDE/ktp-common-internals,leonhandreke/ktp-common-internals,KDE/ktp-common-internals,KDE/ktp-common-internals