Allow returning basis in solve

[rnbwdsh]

Can we add an optional, default-False param to return the basis? I'd need this feature for a project.

Also I'd suggest using int(sympy.sign) instead of redefining sign. If you don't like it, only merge the first commit.

[tclose]

Hi Marcus,

Sorry for the really delayed reply (I flagged the email for follow up and then never got around to it).

That change should be fine.

I note that you have removed the sign function I had defined in the module but it is still used in the return statement of the solve function. I haven't tested out your code directly, does it still work ok?

Cheers,

Tom