allow for mpi4py version 2 or 3 in Python wrapper

More small fixes for stable release

add restartinfo=0 to manbody file it was missing from

Fixes for stable release

Cluster/fragment/aggregate bugfixes

Added error if gcmc is used with molecules on more than one processor

Add make package-installed command

Workaround issue in pair_snap_kokkos

Collected fixes and updates to Colvars library

Collected small cleanups, fixes, and enhancements

thanks to @ExHP for pointing out this issue

we do not call memcpy() unless nbytes != 0 and source/target pointer is not NULL
we error out on illegal combinations of nbytes and inbuf/outbuf

suggested by felipe perez in https://sourceforge.net/p/lammps/mailman/message/36236631/

This commit includes several fixes to moving restraints; also added is support
for runtime integration of 2D and 3D PMFs from ABF.

Mostly changes to existing member functions, with few additions in classes not
directly accessible by LAMMPS.  Also removed are calls to std::pow(), replaced
by a copy of MathSpecial::powint().

Relevant commits in Colvars repository:

7307b5c 2017-12-14 Doc improvements [Giacomo Fiorin]
7f86f37 2017-12-14 Allow K-changing restraints computing accumulated work; fix staged-k TI estimator [Giacomo Fiorin]
7c1c175 2017-12-14 Fix 1D ABF trying to do pABF [Jérôme Hénin]
b94aa7e 2017-11-16 Unify PMF output for 1D, 2D and 3D in ABF [Jérôme Hénin]
771a88f 2017-11-15 Poisson integration for all BC in 2d and 3d [Jérôme Hénin]
6af4d60 2017-12-01 Print message when issuing cv delete in VMD [Giacomo Fiorin]
4413972 2017-11-30 Check for homogeneous colvar to set it periodic [Jérôme Hénin]
95fe4b2 2017-11-06 Allow abf_integrate to start in bin with 1 sample [Jérôme Hénin]
06eea27 2017-10-23 Shorten a few constructs by using the power function [Giacomo Fiorin]
3165dfb 2017-10-20 Move includes of colvarproxy.h from headers to files [Giacomo Fiorin]
32a867b 2017-10-20 Add optimized powint function from LAMMPS headers [Giacomo Fiorin]
3ad070a 2017-10-20 Remove some unused includes, isolate calls to std::pow() [Giacomo Fiorin]
0aaf540 2017-10-20 Replace all calls to std::pow() where the exponent is not an integer [Giacomo Fiorin]

Make default argument for virtual method Neighbor::build() explicit

Make default argument for pure method Integrate::setup() explicit

argument for Integrate::setup() made explicit