Fix multiple misspellings of "suppress"

AFAICT "supress" is not a recognized alternate spelling: http://www.merriam-webster.com/dictionary/suppress
make linter happy without using "boss" option
Area-versus-number interactive
Restore correct # atoms after stepping back/fwd

[#47167567]
disp add/remove events when tick history changes #

[#47167567]
Make sure results array length always == # atoms

[#47167567]
md2d view: remove exited particles on repaint

[#47167567]