.pxd files not included in PyDAS installation

[jwallen]

The .pxd files should be installed alongside the compiled modules in order to allow users to easily compile and link Cython modules against PyDAS.

The .pyx files could also be installed in order to provide another way for users to find the source.

[jwallen]

The best I've been able to do so far is to get all Python-like files in the root project directory to install by adding the parameter packages=[''] to the setup() call. This grabs all the files we'd want, but also grabs the test files, which I'd rather not have. I'd suggest at least moving the test scripts into a test subdirectory.

The packages=[''] syntax is kind of odd, and seems like it could have unexpected side effects. Therefore it might also make sense to move things into a pydas package, e.g. pydas.dassl and pydas.daspk modules instead of pydas and pydaspk. This would give more intuitive naming, but would require everyone to update their code. Feedback would be welcome on this.

@rwest: Once this is working we can remove the unsightly pydas.pxd file from the RMG-Py root directory.

[rwest]

pydas.dassl and pydas.daspk (and pydas.thenextthing) sounds better to me than pydas (being dassl) and pydaspk (being daspk). I'd be OK with a change that requires code updates in other projects. Especially if there's a way to flag it with a version number bump or something, and a note somewhere obvious about what the required changes are. It would be a bit annoying breaking backwards compatibility though, for example if different topic branches of RMG-Py switch over at different times...