Build OpenMM 7.3.1 release candidate

[peastman]

@jchodera can you check that all of this looks correct?

[jchodera]

Looks good! We've been having issues with the conda-build compiler toolchain again (sigh) so we may need to do some debugging to get this built.

Have been buried in grantwriting this week...apologies for the slow response.

[peastman]

A bunch of the builds are failing. For the Mac builds, it looks like it's because the script invokes brew -y, and there's no such option as -y. For the Windows builds it has the error message

Error: bad character '"' in build/string: py37_cuda"100"_rc_1

[jchodera]

For the Mac builds, it looks like it's because the script invokes brew -y, and there's no such option as -y

They keep changing the syntax. We've fixed that elsewhere, but not here. Can you implement this fix and get rid of the -y globally?

For the Windows builds it has the error message

We can't build conda packages for win using this build machinery yet. I started to experiment with this in this PR, but never got very far:

#2

[jchodera]

I did get pretty far in the AppVeyor overhaul in #2, and installation of the CUDA 10.0 toolkit actually worked---but I think we're still building for CUDA 9.2, right?

[peastman]

Right.

[jchodera]

OK, this should push all the packages after a few tries.