rebase

Fix bond react

Collected small changes and bug fixes for the next patch release

Replace C-style include files with their C++ equivalents

Fixes to Colvars library (version 2018-04-29)

updates to quadratic form of SNAP potential

This reverts commit f202f1bc.

Primarily a list of small fixes, combined with cosmetic changes and cleanups
in several files.

6d0c917 2018-04-29 Fix missing deallocation of output stream object (reported by HanatoK) [Giacomo Fiorin]
c92d369 2018-04-17 Do not test for atom group size [Jérôme Hénin]
431e52a 2018-04-06 Allow scripted/custom colvars to be periodic [Jérôme Hénin]
81d391f 2018-04-05 Split colvarcomp constructor into POD constructor + init() function [Giacomo Fiorin]
9b85d5f 2018-03-13 Fix issue with out-of-order atom selections; clarify format for ref positions [Giacomo Fiorin]
0e0ed37 2018-03-07 Support triclinic unit cells in VMD, clean up PBC functions [Giacomo Fiorin]
eed97c9 2018-02-24 Obtain integer version number from version string [Giacomo Fiorin]
c17f3cd 2018-02-23 Write trajectory labels only when needed [Giacomo Fiorin]

with this commit, write_data() support should be complete.

rebase

Tweaks to KOKKOS package

Bugfix for fix ave/correlate/long

remove mention of as yet unreleased feature

this is done supporting the combination of type == 2 with style == 0,
i.e. a local scalar, which is not available in C++ (but there one can
access the compute style data member directly. for the python interface,
the pointer is automatically dereferenced and returned as a c_int.

fixes crash e.g. when building on Ubuntu for Windows
thanks to Márk Jenei (University of Cambridge) for submitting error report

Write_data nofix option

add info to compute heat/flux doc page and a small update to the developer's guide

cmake: update latte to v1.1.1