minor, change semantics of ctl_price_return()
minor, kill -F|--forward switch from exp subcommand as it makes no sense
fix, PEBKAC, use yuck_cmd_log_s struct for cmd_log()
test, provide more regression cases for cattle exp command
minor, provide ctl_kvv_get_caev_code() auxiliary ...

... and factor out similar code in ctl_kvv_get_caev().
minor, use ctl_kvv_get_caev_code() in log routine to only log CTL1 corporate actions
test, adapt regressions, log(exp) is total payout again
minor, provide -a|--all to cattle(1) log to logarithmise anything
Merge branch 'cmd/explog'

* cmd/explog:
  minor, provide -a|--all to cattle(1) log to logarithmise anything
  test, adapt regressions, log(exp) is total payout again
  minor, use ctl_kvv_get_caev_code() in log routine to only log CTL1 corporate actions
  minor, provide ctl_kvv_get_caev_code() auxiliary ...
  test, provide more regression cases for cattle exp command
  fix, PEBKAC, use yuck_cmd_log_s struct for cmd_log()
  minor, kill -F|--forward switch from exp subcommand as it makes no sense
  minor, change semantics of ctl_price_return()