Installing cylp in a robust, portable, neat way about cylp HOT 10 OPEN

Most importantly we need Py3!

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Hey @tkralphs , do you think you might find a bit of time to check this issue out? Between this and py3 issues it's really a showstopper both for this lib and to the use of CBC with CVXPY.

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Yes, I'll look at it as soon as I can.

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Hey @tkralphs does the pip command work without setting the COIN_INSTALL env variable (or whatever it was)?
That is my biggest issues in using CyLP in reproducible Conda environments

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When is it not enough to (possibly) install a few packages to get dependencies and then to install cylp?

My use case was running cylp inside an Amazon Lambda function. It took me weeks to get that working.

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@tkralphs great work on making cylp work with Python 3 on Windows. I think making pip install cylp work on Linux (and other OS's, for that matter) is really key to make it usable at production level.

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I did take a look at these scripts. To understand everything they're doing and make the whole thing bulletproof looks like a good amount of work, so I guess I need to understand better what the need is for something like this. I have no problem myself doing pip install cylp in Linux and I think it should work without a problem for most people, but I realize that the use case described in this issue is an entirely different animal. Are there many people out there with the need for such an installation procedure? When is it not enough to (possibly) install a few packages to get dependencies and then to install cylp? The scripts seem like overkill in all but a few cases.

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BTW Kudos on the work you have been doing.

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There has to be some way to find the installation, which was the purpose of that variable, but I've now added several other ways, including checking the PATH for clp and looking for .pc files in the PKG_CONFIG_PATH. If you've installed Cbc with a package manager in Linux or with Homebrew in OSX, you shouldn't need to do anything. I guess this is about as good as it can get. Let me know if there are further improvements I can make for your use case.

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@matt-telstra Yeah, I did get your use case, but don't know how common that is and don't want to spend heaps of time making your solution bullet-proof if there's not much demand. Too many fish to fry :).

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