bug 46. lessen the amount of output from swift in case of bad commandline parameters or missing input file. now a short usage string is displayed, with the full usage listing reserved for -help
bug 46. lessen the amount of output from swift in case of bad commandline parameters or missing input file. now a short usage string is displayed, with the full usage listing reserved for -help

git-svn-id: 6ee47c8665bf46900d9baa0afb711c5b4a0eafac@632 e2bb083e-7f23-0410-b3a8-8253ac9ef6d8

ya7lelkom/swift-k,ya7lelkom/swift-k,swift-lang/swift-k,swift-lang/swift-k,swift-lang/swift-k,swift-lang/swift-k,swift-lang/swift-k,swift-lang/swift-k,ya7lelkom/swift-k,swift-lang/swift-k,swift-lang/swift-k,swift-lang/swift-k,ya7lelkom/swift-k,ya7lelkom/swift-k,ya7lelkom/swift-k,swift-lang/swift-k,ya7lelkom/swift-k,ya7lelkom/swift-k,ya7lelkom/swift-k,ya7lelkom/swift-k