Updated Readme.md and header file
Need to add reflections?
Merge branch 'master' into working
Revised the coding for searchGroups_px. This still does not account for reflections.
Added apply_abcd function to mirror tocta about horizontal plane.
This version of searchGroup_px.c correctly finds the reflections. All the code is
'inline' which makes it difficult to read. Consider writing function to do the 'find and flag' section, or a #DEFINE macro