Complete rewrite of s-dftd3

Author: awvwgk

.gitignore

@@ -32,5 +32,5 @@
 *.app
 
 # Directories
-build*
-_build*
+/build*/
+/_*/

.travis.yml

@@ -0,0 +1,165 @@
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COPYING.LESSER

@@ -1,4 +1,6 @@
-# Reimplementation of the DFT-D3 program
+# The D3 dispersion model
+
+A simple drop-in replacement for ``dftd3``.
 
 This program provides a small and easy to use implementation of the DFT-D3
 dispersion correction
@@ -8,36 +10,55 @@ and [*JCC* **32**, 1456 (2011)](https://dx.doi.org/10.1002/jcc.21759) for detail
 It is mostly based on the [`dftd4`](https://github.com/dftd4/dftd4) program and
 borrows one or two ideas from the implementation in [`ased3`](https://github.com/ehermes/ased3).
 
-Right now it is more a playground to test various features, designs and tools.
+## Installation
+
+To build this project from the source code in this repository you need to have
+- a Fortran compiler supporting Fortran 2008
+- [meson](https://mesonbuild.com) version 0.53 or newer
+- a build-system backend, *i.e.* [ninja](https://ninja-build.org) version 1.7 or newer
 
-## Installing
+Setup a build with
 
-To build this project we use [`meson`](https://mesonbuild.com/) and require
-a fairly new version like 0.49 or newer for a decent Fortran support.
-For the default backend [`ninja`](https://ninja-build.org/) version 1.5 or newer
-has to be provided.
+```
+meson setup _build
+```
 
-To perform a build run
+You can select the Fortran compiler by the `FC` environment variable, currently this project supports GCC and Intel compilers.
+To compile the project run
 
-```bash
-meson setup build_gcc
-ninja -C build_gcc test
+```
+meson compile -C _build
 ```
 
-You can install the program locally by running install with `ninja`
+You can run the projects testsuite with
 
-```bash
-[sudo] ninja -C build_gcc install
 ```
+meson test -C _build --print-errorlogs
+```
+
+If the testsuite passes you can install with
+
+```
+meson install -C _build
+```
+
+This might require administrator access.
+You can alter the install prefix by ``meson configure _build --prefix=/path/to/install``.
+
 
 ## License
 
-`s-dftd3` is free software: you can redistribute it and/or modify it under
-the terms of the GNU General Public License as published by
+This project is free software: you can redistribute it and/or modify it under
+the terms of the GNU Lesser General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
 
-`s-dftd3` is distributed in the hope that it will be useful,
+This project is distributed in the hope that it will be useful,
 but without any warranty; without even the implied warranty of
 merchantability or fitness for a particular purpose.  See the
-GNU General Public License for more details.
+GNU Lesser General Public License for more details.
+
+Unless you explicitly state otherwise, any contribution intentionally
+submitted for inclusion in this project by you, as defined in the
+GNU Lesser General Public license, shall be licensed as above, without any
+additional terms or conditions.