Allow setting several names using 'name' property instead, e.g.
':name "-f --foo"' instead of ':aliases {"-f", "--foo"}'.
This change breaks documented interface of 0.3.x.
Disable undocumented ability to specify aliases as arguments
for constructors, e.g. parser:option("-f", "--foo"), and instead
order properties and pass constructor arguments to them.
E.g. parser:argument("foo", "A foo that bars") sets argument
name to foo and description to "A foo that bars".
TODO: remove "aliases" property, instead allow setting several
names in one string by separating them using space.
TODO: reorder properties so that most useful ones could be used
as constructor arguments.
mpeterv