GitLab

Force libtool to static link the PIC version of our jemalloc import into
libaml, making libaml standalone. This requires us to test some
additional libraries in our own configure (pthread, and dlopen).

This also solves the long-standing issue of `make check` only working after
`make install`, while removing our custom jemalloc from the installed
libraries.

Fixes #26.

We are starting to work on benchmarks to evaluate the usefulness of this
library. Instead of integrating them into the testing infrastructure, it
makes more sense for them to have their own directory and a different
way of handling them.

This patch:
 - creates a benchmark directory for actual codes that we want to use as
   benchmarks of our library.
 - moves functional tests into it.
 - add proper OpenMP detection for these codes