Added lots of debugging lines. Changed no real code, but seems to work!
Parallel line Q now looks for 1 parallel line with a simultaneous intersection with two compasses
Clean up debug code ready to create pull request
Merge pull request #161305 from simonjtyler/FixConstructions1

New validator for parallel line exercise in constructions_1, fix #155778 #129989 #156728
Auditor: peter