Add libreg/doc/measurement/least_squares.xlsx
Add cctest/scripts/sandbox/PlepTests/pleps.cct
Clean up cctest scripts for sandbox PlepTests
Update cctest/scripts/run_header.sh to work with new cctest
Update libreg
Update cctest/inc/flot/flot_part0.htm to remove LiveReload script
Update cctest/inc/flot/flot_part2.htm to remove cctest page header
Update cctest header files
Update cctest source files