Supporting files.
No need for contrib/
Test showing the parsing bug.
Making level contain both the linenum and the colnum.
Mode detailed error message for path location.
Two more tests added to the main parser test.
More detailed tests added to regression. (These duplicate some in the main parser-yaml test.)
Fixing level being both linenum and column
Correcting parser behavior for 'test_deep_mapping_with_dash'

This correct parsing behavior for test_deep_mapping_with_dash though locations of paths are still imprecise (reports on wrong line). In addition, this change breaks the rather pathological case

- A

-

    - B

-

which seems like a good compromise.
Merge branch 'parser-update'