Omega: Missing support for newer weighting schemes

[Vivek Pal]

>> Also, turns out that parse_params method is identical to unserialise() method
>> in each Weight subclass so why not simply use unserialise method rather than
>> implementing the same functionality that it provides under a different name
>> like parse_params to avoid code duplication?
>
> They're conceptually similar, but unserialise() takes a binary serialisation
> of the parameters (so it can easily and compactly pass floating point values
> exactly), whereas here we need to parse an ASCII string representation of
> the parameters.

Ah, yes indeed. Thanks for clearing that up.

>> In fact, the following code works just fine for all tests:
>>
>>   enq.set_weighting_scheme(*wt->unserialise(p));
>
> Currently omega has no test coverage for parsing of weighting schemes, so the
> tests passing doesn't mean this works correctly.
>
> (We only added any tests of the omega CGI about 18 months ago, and at present
> we really only have tests of changes since then - feature tests for new
> features and regression tests for bug fixes).

Oh, didn't realise there were no tests for this functionality.
Probably, the next thing
would be to write some tests afterwards.

Thanks,
Vivek