* misc: main button bar remembers focus
* misc: set information -> 'unload' (set list) button added
* misc: set information -> you can use '%h=1' in 'select sets' to select sets with chds
* misc: set information -> you can use '%p=1' in 'select sets' to select sets with samples
* misc: set information -> split 'mark parent/clones' to two separated checkboxes
* misc: set information -> mark parent/clones checkboxes also affect loading of set lists
* misc: don't show warning for clones where all not-parent roms are nodumps
* misc: introducing datfile header switch "forcenodump" which can be 'obsolete', 'ignore' and 'required': obsolete = default (nodumps are marked as unneeded, missing ones are not shown); ignore = existing nodumps are not marked as unneeded, missing ones are ignored; required = existing nodumps are not marked as unneeded, missing ones are shown
* misc: dir2dat->nodump header options available
* misc: allowing empty set definitions (theoretically this allows using of pseudo parents)