Rename files for pair style eam/cd/omp in USER-OMP

cmake: fix Eigen3 detection

cmake: fix globbing of emacs files

Avoid buffer overflow during errors with long filenames

Correct multiple issues in manual build

small doc page changes, format and content on doc page tarballs

Bugfix pair morse smooth linear

Avoid unnecessary sorting in print_columns

Expand the list of code owners for more automated review requests

Done by: sed -i '/GLOB/s@/\*\.@/[^.]*.@g' CMakeLists.txt

For some reason FindEigen3.cmake defines all cap. variables, i.e.
Eigen3_FOUND -> EIGEN3_FOUND

cmake: add missing fix_omp.h and fix_omp.cpp to compilation

Add data duplication option to the KOKKOS package

[Feature Contribution] Scafacos

std::map is a sorted associative container. We don't need to
first copy it into a vector and sort that one.
print_columns has been refactored as a template function and
makes use of this property.

Collection of CMake fixes

cmake: only add tests if exe is build