+ FEAT: All messages explain how to re-run with effecting changes.
+ REFACT: x3 utility functions emulating GnuMake.
+ refact: split sub-actions into separate ones,
  now that checks are cheaper.

* feat: provide help-msg if --help/-h given anywhere in args.
* refact: simplify help-msg formatting in one cmd.

with conda (de)activation- scripts, to pick the actual var values.

when it is overridden by `git config vars set PATH`
since this command is run BEFORE env has been activated,
and the PATH is still the pre-activation one.

* feat: put our path 1st in env PYTHON/PATHs.

so as to reload terminal-session with all RC-files updated,
before creating conda-env
(eg `~/.condarc` to speedup things).

put conda_init last, the lat one to execute on the 1st run.

don't erase its old value.

as instructed by BDAP docs, to avoid default location,
which by default is user's home rc-folder.

fix(make): create intermediate dummy rule.

* enh: finalize Setup scripts & Instructions.
* feat: setup-account.sh --help.
* refact: print actions if no args given.
* enh: slicence makefile execs.

not to be confused with `setup.py`,
and to prepare for `setup-project.sh`

- TODO: installation