Support command-line arguments using getopt

[chris]

Add command-line argument support using getopt.

Initially start with, at least:

-h --help : show usage

-v --verbose : enable verbose output

[zts]

It might be worth using optparse rather than getopt, as it's a great deal more elegant. It was only added in 2.3, but was previously available as "optik" and works on 2.2+ - BSD-licensed, so I think we could redistribute it (it's quite compact).

[chris]

Agree with optparse (I'm sure that's what I meant to type originally as that's all I use now); and may as well continue to support 2.2.1 if it is little effort to do so.

[zts]

This has been done in rev @793 - needs testing under 2.2.x with Optik, I've verified correct behaviour on 2.3.

[chris]

It was failing for me with Py 2.3, because of reference to options.version. Have corrected this and parser.error() call which was failing too. Tested ok on Py 2.3 and 2.4. We'll need to verify on earlier versions. See [802].