tools: error handling
This run shows two problems:
$ vcsn tools standard -Ee e | vcsn tools is-deterministic -Af -
error: is-deterministic: no matching algorithm
candidates are:
Try 'vcsn is-deterministic --help' for more information.
$ vcsn tools standard -Ee e | vcsn tools is_deterministic -Af -
1
-
when the algorithm does not exist at all, we don't say it clearly -
we still have to use _ instead of - when discussing with vcsn tools -
once this is fixed, simplify bin/vcsn
: it should not play sed tricks