[IZPACK-1096] Allow panel validators to be conditional
Merge pull request #203 from rkrell/IZPACK-1096

[IZPACK-1096] Allow panel validators to be conditional
[IZPACK-1093] SummaryPanel shows content of skipped and not relevant panels (post-fix: panel condition did override createForPack constraint)
Merge pull request #204 from rkrell/IZPACK-1093

[IZPACK-1093] SummaryPanel shows content of skipped and not relevant panels