4.048c
fixed: wrong "Error while..." message after delta operation succeeded but backup is disabled.
misc:  minor changes to the delta output messages

4.048b
fixed: wrong delta chd proposals in full merged mode (identical chds)

4.048a
fixed: unneeded scan crashes/exits
misc: limiting delta chd support for chd version >=5

4.048
added: delta chd support, show warnings, support convert/revert of chds
fixed: MAME 260 "samples" issue (is shown as unneeded and not found)

