C code for Dopri/Radau interface to Python is awful

[z2v]

Needs refactoring and whitespace clean up.

[robclewley]

Agreed. The ctypes rewrite that I sent you should help to show how this can be done more simply.

[z2v]

@robclewley, for now I am not ready to rewrite interface. I'm just going to remove some duplication and to fix formatting. In preparation for memory problems fixing.

Current code is tested and works somehow :). And, as it seems to me, after migration from numarray to numpy there are no strong points for immediate rewriting. Though, in general, it makes sense. What do you think?

[robclewley]

@z2v, that's fine, you've done a lot already! The ctypes prototype interface is much simpler and most likely a few percent faster but we'll get to that when someone has more time. I posted one more irritating issue about pickle that it would be nice to have fixed for this release. I don't think I'll have time to do it before the conference that I'm preparing for, but it's not a big deal either way. Thanks.