Thanks to Giacomo Fiorin for figuring this out with NAMD/Colvars.
This requires linking with -Xlinker -export-dynamic or equivalent,
which is the default when using python-config to provide linker flags.
We will fall back to loading the DSO in case the initial load fails.

Collected small changes and bugfixes

USER-DPD Bugfix: reset_dt() is not called when I thought it should be called.

Move the calculation of dtsqrt inside FixShardlow::initial_integrate()

USER-DPD: Add atom_style compatibility checks in fix_eos_*.cpp files.

USER-DPD: add support for using VV with DPD

make no-lib should also remove MPIIO and USER-LB packages

Improper virial bugfixes

this closes #56

txt2rst external link fix

Add respa support to fix flow/gauss

workaround for double free issue when using USER-COLVARS with with lammps python wrapper and python package

Migrate changes from GRANULAR to USER-OMP

(cherry picked from commit eff14c74b039f074627c84a3f51a11b52c494d92)

(cherry picked from commit fd560889c3b9a81789a1900bef9a27aa79528cb3)

(cherry picked from commit d7dcbcfbd9c663ad7a1e1ce0989cd6347651fe21)

(cherry picked from commit 7fc4d46a417ff932546b34d6beacc47890823bd7)

(cherry picked from commit c829027e83971ad4739578cf413def88818ac40e)

(cherry picked from commit 8d9737b04df5158d512b7708023af0b154899fa9)

workaround for double free issue when using USER-COLVARS with lammps code loaded as shared library into a standalone executable

Includes documentation and examples.
NOTE: VV requires very small timesteps under isoenergetic conditions.
Consider using fix_shardlow instead, since this VV support is
primarily for comparison purposes.