chore, remove --flow|-f from roll subcmd ...

in favour of a subcmd flow.

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
hygiene, improve truf_str_p() predicate, allow sym.u == 0U

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
major, in roll output leave space for a symbol (which is the empty string atm)

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Revert "major, in roll output leave space for a symbol (which is the empty string atm)"

This reverts commit 2e9b602d756a73d47c7388ead0c235f958ad580c.
minor, provide co_tser_rdr() to specifically return (a modifiable) truf_step_t

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, provide simple flow command

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, use co_tser_rdr() in co_tser_flt() instead of parsing stuff again

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
test, disable -f|--flow tests

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
hack, provide --no-symbol option for flow subcommand to skip parsing symbols

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
test, rewrite -f|--flow tests using the flow subcommand

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'cmd/flow'

* cmd/flow:
  test, rewrite -f|--flow tests using the flow subcommand
  hack, provide --no-symbol option for flow subcommand to skip parsing symbols
  test, disable -f|--flow tests
  minor, use co_tser_rdr() in co_tser_flt() instead of parsing stuff again
  minor, provide simple flow command
  minor, provide co_tser_rdr() to specifically return (a modifiable) truf_step_t
  Revert "major, in roll output leave space for a symbol (which is the empty string atm)"
  major, in roll output leave space for a symbol (which is the empty string atm)
  hygiene, improve truf_str_p() predicate, allow sym.u == 0U
  chore, remove --flow|-f from roll subcmd ...