Check the return value for success in the tests script
Change exit values to follow the BSD convention (as documented in sysexits.h)
Remove an error check not useful (it's checked in the calling functions)
Update manpage to fit with error messages and add a sentence about the BSD exit values
increment minor number version for the BSD exit values behaviour
Merge pull request #7 from sblondon/error_values

Changes to error value handling
Just cleanups to the man page and other small things.