bug fix for compute cluster/atom when computing values used to update…

KOKKOS Package bugfix: Workaround for issue #1037

Add extra check for OpenCL timers

enable more correct natoms computation when atoms are lost

USER-UEF support for image flags

Fixes issue #1034 by preventing time() to access non-existent OpenCL events

replace Section_commands.txt file

bug-fix for slope() function in variable

Allow cross-compiling from linux to windows with cmake

changes for Intro and Howto doc pages

Fix discrepancies between fix_nh and papers

Collected small fixes for the next patch release

Move pair style eam/cd from USER-MISC to MANYBODY

docs:  Fix spelling mistakes and clarify Tools.txt

emacs: Update mode file