relnotes.md

`lammps-sys` release notes

Update to stable_7Aug2019, to "fix" builds for GCC 9.0. (unfortunately this disables OpenMP for that compiler). The major version has been bumped in case any backwards incompatible changes occurred in LAMMPS.

Fix automatic builds to actually work when using the crate files published to crates.io. (oops!)

Update automatically-built LAMMPS version to patch_18Sep2018.
Added back the ability to use prebuilt libs. This is automatically supported through pkg-config, though you probably need to set up a liblammps.pc file (see the files in doc/ for assistance).
lammps-sys now internally uses the CMake build system recently added to LAMMPS, rather than the classic Makefile build system.
Removed the RUST_LAMMPS_MAKEFILE environment variable, which is no longer relevant with the new CMake-based builds.
Added back MPI support. There is now an "mpi" feature which enables the binding for lammps_open, and links to the mpi-sys crate. This is a great deal more reliable than v0.3.0's "system-mpi" feature, so don't be afraid to use it!
Added a feature for every package. These are almost entirely untested; please report bugs!
Remove default feature for "exceptions". Default features are too hard to disable.
Removed the "bigbig" feature, which did not make sense as a feature. If you need it, build lammps as a shared library (and make sure -DLAMMPS_BIGBIG is present in the Makefile's LMP_INC and in the cflags: line of liblammps.pc)

Automatically builds LAMMPS from source now.
Completely different building model. Formerly, only dynamic was supported; now, only static is supported. It is now possible to simply add lammps-sys as a dependency and have it Just Work... if you are lucky.

Use bindgen's trust_clang_mangling(false). This prevents the erroneous introduction of mangled #[link_name] attributes on systems with older libclang versions.