[tkralphs]

This moves CoinMP master to the build setup of the other converted projects (Clp, Cbc, Dip, ...). configure.ac is based on BuildTools master, the CoinMP/ subdirectory is gone, and the C API is exported through COINMPLIB_EXPORT. It also adapts CoinMP to Cbc master, adds the GitHub Actions CI, .coin-or/config.yml and generate_readme, and relicenses CoinMP from the CPL 1.0 to the EPL 2.0. The stable branch gets the CI and config.yml in a separate PR.

Commits

1. Moving to new autotools, removing superfluous files, preparing to remove root directory
   • configure.ac uses AC_COIN_CHK_PKG and AC_COIN_FINALIZE_FLAGS([CoinMPLib]). CoinUtils, Osi, Clp, Osi's Clp interface, Cgl and Cbc are all required, because CoinMP uses each of them directly. There is one .pc file per check.
   • Headers are installed to include/coin-or, and coinmp.pc.in uses the standard template.
   • The example's makefile gets its flags from coinmp.pc and links with the C++ compiler.
   • CoinMPConfig.h and its config_* headers follow Clp's ClpConfig.h and define COINMPLIB_EXPORT.
   • The root-level build files and the SVN Externals file are removed, along with the root AUTHORS, INSTALL, LICENSE and README, which pointed to the copies in CoinMP/.
   • The MSVisualStudio projects are kept (moved to the root, but not updated), as in Dip.
2. Removing root directory: pure renames of CoinMP/* to the root, plus the CoinMP/ prefix removed from .gitignore.
3. Exporting symbols
   • The functions of the C API in CoinMP.h are declared with SOLVAPI. That is now COINMPLIB_EXPORT unless it is set otherwise; the hand-written MSVC branch at the top of CoinMP.h is unchanged.
   • CoinMP.cpp includes CoinMPConfig.h instead of config_coinmp_default.h, so that the build gets config.h.
4. Adapt to the CbcParameters of Cbc master: CbcSolverUsefulData is now CbcParameters, whose noPrinting_ isn't public, so CoinMP calls disablePrinting() instead.
5. Add GitHub Actions CI, config.yml, and generate_readme; relicense under EPL 2.0
   • Workflows from the same templates as the other projects. Linux builds with -fvisibility=hidden.
   • config.yml lists CoinUtils, Osi, Clp, Cgl and Cbc master. Dependencies moves to .coin-or/.
   • README.md is generated. The package section is adjusted to the real packages:
     • Arch coin-or-mp, Debian/Ubuntu coinor-libcoinmp-dev, FreeBSD math/coinmp, and conda-forge coinmp;
     • Fedora's package is retired, and there is no Homebrew formula.
   • Manager: Bjarni Kristjansson, as in projDesc.xml.
   • License: CoinMP is relicensed from the Common Public License 1.0 to the Eclipse Public License 2.0, like the rest of the Suite, and the comments that mentioned the CPL are updated.
   • The Travis and AppVeyor setup is removed.
6. README: regenerate with the fixed generate_readme of coinbrew#109. The packages are now set in generate_readme instead of filtering the output of make_build_info with awk and sed, and the MSYS2 package is added. The README also picks up the Homebrew, Docker Hub and Doxygen fixes of generate_readme: list only binary packages that exist; Homebrew tap trust coinbrew#109, as README: regenerate with the fixed generate_readme (binary packages, Homebrew trust, links) #31 does on stable/1.8.
7. README workflow. Adds .github/workflows/readme.yml, which calls the reusable workflow of Add a reusable workflow that regenerates and checks project READMEs coinbrew#110 to regenerate README.md and check pull requests that change it. The CI workflows skip builds when only README files change. This is the same as in README: regenerate with the fixed generate_readme (binary packages, Homebrew trust, links) #31 on stable/1.8.

Testing (Linux, gcc, against the master stack)

• -fvisibility=hidden build: make test passes; all 8 problems of the unit test solve.
• Exports: libCoinMP exports all 82 SOLVAPI functions.
• Installed library: after make install, the C example builds against the installed headers and coinmp.pc and runs.

Merge order

The unit test crashes with current Cbc master: Cbc segfaults at the end of the search when the event handler is a user's (CoinMP's). coin-or/Cbc#813 fixes that by porting Haroldo's fix from next. Until it is merged, this PR's CI fails in the unit test.

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