Merge branch 'master' into refactor-reading

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        OR (${CMAKE_CXX_COMPILER_ID} STREQUAL "Clang"))

      include(CheckCXXCompilerFlag)

      set(CMAKE_CUSTOM_LINKER_DEFAULT default)

      check_cxx_compiler_flag(-fuse-ld=lld HAVE_LLD_LINKER)

      check_cxx_compiler_flag(-fuse-ld=gold HAVE_GOLD_LINKER)

      check_cxx_compiler_flag(-fuse-ld=bfd HAVE_BFD_LINKER)

      if(HAVE_LLD_LINKER)

      check_cxx_compiler_flag(-fuse-ld=lld HAVE_LLD_LINKER_FLAG)

      check_cxx_compiler_flag(-fuse-ld=gold HAVE_GOLD_LINKER_FLAG)

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   incorrect periodic images of atoms in interaction lists.  To avoid, either use

   :doc:`pair style zero <pair_zero>` with a suitable cutoff or use :doc:`comm_modify cutoff <comm_modify>`.

*Communication cutoff is shorter than a bond length based estimate. This may lead to errors.*

   Since LAMMPS stores topology data with individual atoms, all atoms

   comprising a bond, angle, dihedral or improper must be present on any

   sub-domain that "owns" the atom with the information, either as a

   local or a ghost atom. The communication cutoff is what determines up

   to what distance from a sub-domain boundary ghost atoms are created.

   The communication cutoff is by default the largest non-bonded cutoff

   plus the neighbor skin distance, but for short or non-bonded cutoffs

   and/or long bonds, this may not be sufficient. This warning indicates

   that there is an increased risk of a simulation stopping unexpectedly

   because of Bond/Angle/Dihedral/Improper atoms missing.  It can be

   silenced by manually setting the communication cutoff via

   :doc:`comm_modify cutoff <comm_modify>`.  However, since the

   heuristic used to determine the estimate is not always accurate, it

   is not changed automatically and the warning may be ignored depending

   on the specific system being simulated.

*Communication cutoff is too small for SNAP micro load balancing, increased to %lf*

   Self-explanatory.

   \left[ 1 - \frac{\left(5 ~ a^6+45~a^4~r^2+63~a^2~r^4+15~r^6\right) \sigma^6}

   {15 \left(a-r\right)^6 \left( a+r \right)^6} \right], \quad r < r_c

where :math:A_{cs}` is the Hamaker constant, *a* is the radius of the colloidal

where :math:`A_{cs}` is the Hamaker constant, *a* is the radius of the colloidal

particle, and :math:`r_c` is the cutoff.  This formula is derived from the

colloid-colloid interaction, letting one of the particle sizes go to

zero.

location of the (rightmost) minimum of the potential, as explained in

the syntax section above.

This potential was first used in (Cooke)_#CKD for a coarse-grained lipid

This potential was first used in :ref:`(Cooke) <CKD>` for a coarse-grained lipid

membrane model.  It is generally very useful as a non-specific

interaction potential because it is fully adjustable in depth and width

while joining the minimum at (sigma, -epsilon) and zero at (cutoff, 0)

than *sigma*\ .

If the *wca* option is used then a Weeks-Chandler-Andersen potential

(Weeks)_#WCA is added to the above specified cosine-squared potential,

:ref:`(Weeks) <WCA>` is added to the above specified cosine-squared potential,

specifically the following:

.. math::