… specifying local spec file)
…ong with 'install' command.
…-targets Conflicts: rebar.config
… in case if there are any
…is/agner into jlouis-optparse-handle-missing-arg
When missing an option argument, the system normally died. This prints out a helpful error message in the event. It also slightly reorders the option parsing, so it takes place before the start()/stop() sequence. In principle this lets us bail out faster.
Reap the benefits of the preceding commits: Output a usage list where the valid, supported, commands are included. Note that adding a command to the parser will automatically extend the usage output.