WIP: add tests for libvdwxc; add libvdwxc to build system
Description
Integrate libvdwxc with build system. This adds an m4 file for libvdwxc with the option --with-libvdwxc-prefix=<dir>
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Add unit tests of libvdwxc.
Closes: #122 (closed).
Edited by Ask Hjorth Larsen