Drop deprecated Incremental modes like "All6". You can now use -min-len and
-max-len instead. Also add an entry for "custom.chr" which will not be
supplied - it's convenient for one-off charsets.
Merge branch 'bleeding-jumbo' into memdbg

* bleeding-jumbo:
  Drop deprecated Incremental modes like "All6". You can now use -min-len and -max-len instead. Also add an entry for "custom.chr" which will not be supplied - it's convenient for one-off charsets.