Drop incrementals "try" counter, which was naively updated at every call to
crk_process_key(), in favour of the now existing status.cands which is better
implemented. This also means I could drop Jumbo-specific code for restoring
progress - status.cands is already handled by core.
Bugfix: The "3/3" batch mode output was mistaken for a percent figure.
Merge branch 'bleeding-jumbo' into memdbg

* bleeding-jumbo:
  Bugfix: The "3/3" batch mode output was mistaken for a percent figure.
  Drop incrementals "try" counter, which was naively updated at every call to crk_process_key(), in favour of the now existing status.cands which is better implemented. This also means I could drop Jumbo-specific code for restoring progress - status.cands is already handled by core.