upcxx-meta needs -h/--help and argument validation

[Dan Bonachea]

The upcxx-meta command line interface is currently very unfriendly.

It accepts any argument on input, and for anything unrecognized spits out garbage, eg:

> $UPCXX_INSTALL/bin/upcxx-meta -h 
hBh
> $UPCXX_INSTALL/bin/upcxx-meta --help
hB-help
> $UPCXX_INSTALL/bin/upcxx-meta --version
hB-version
> $UPCXX_INSTALL/bin/upcxx-meta foo

>

Given this is our user-facing interface, this needs to be made more user-friendly.

[Steven Hofmeyr]

Fixed issue #89 - upcxx-meta now checks the parameters and aborts with an informative message if the parameter is not correct.

→ <<cset 9242d38255c2>>

[Dan Bonachea]

fixup: Fixed issue #89 - upcxx-meta now checks the parameters

9242d38 broke upcxx-meta for non-bash shells

→ <<cset a5cdaca8ad2b>>