Support the already mounted loop fs (example in the blackPanther OS)

Rearranged Replace workflow a bit: onPartitionReplaceSelected is now
the on choice slot, which in turn calls doReplaceSelectedPartition.
onHomeCheckBoxStateChanged also calls doReplaceSelectedPartition if we
need to redo the Replace task with/without a separate home to keep.
m_reuseHomeCheckBox is hidden by default.

Netinstall module. See README for complete guide. Allows to configure...groups and packages; selected packages are installed through the 'packages' module.