Add Windows support

[iSoron]

The package currently fails to build on Windows with the message SCIP is currently not supported on "NT". This pull request fixes this by modifying deps/build.jl to search for the correct DLL. I have verified not only the package builds successfully with these changes, but also that all unit tests pass.

The function write_depsfile needed to be modified because, on Windows, the path variable contains backslashes which need to be quoted.

[codecov]

Codecov Report

Merging #122 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #122   +/-   ##
=======================================
  Coverage   14.11%   14.11%           
=======================================
  Files         134      134           
  Lines        4251     4251           
=======================================
  Hits          600      600           
  Misses       3651     3651

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[rschwarz]

Cool, thanks!

It would be great if we could also set up appveyor to run automated tests on Windows.
I have not done that before, but could look into that later.

[matbesancon]

Maybe we can add it during that PR right away (never done it either)

[matbesancon]

The PR needs to add an appveyor file as in:
https://github.com/JuliaLang/Example.jl/blob/master/.appveyor.yml

[matbesancon]

@rschwarz I think there are some custom steps because of the way SCIP is imported, you know them better than me

[rschwarz]

Maybe we can add it during that PR right away.

Yes, that's what I meant.

I think there are some custom steps because of the way SCIP is imported

Yes, SCIP needs to be downloaded and installed. We also need to set the SCIPOPTDIR variable.

[rschwarz]

@fserra, @mattmilten I've tried to setup AppVeyor integration for SCIP.jl, by installing it to the SCIP-Interfaces group, but only to "selected projects", namely SCIP.jl. If I have disabled the integration for PySCIPOpt through this action (it does not show up in the settings), please let me know or change it back.

[mattmilten]

I guess back when I added appveyor, I only added it for PySCIPOpt.

Edit: It seems I set it up using my personal account on appveyor/GitHub. I don't think that there will be a conflict

[rschwarz]

I guess back when I added appveyor, I only added it for PySCIPOpt.

That's alright. My concern is that I might disabled it for PySCIPOpt inadvertantly.