Fixed problems with JSON item replacement, implemented JSON_DELETE, other test cases.
Fixed problems with JSON item replacement, implemented JSON_DELETE, other test cases.

- Fixed problems with JSON updates replacing whole node tree sections.
- Implemented JSON_DELETE.
- Fixed some testcases that should have returned JSON_INVALID.
- First 79 LL JSON tests pass.  Work in progress. (179 passes, 140
fails)

zwagoth/halcyon,zwagoth/halcyon,emperorstarfinder/halcyon,zwagoth/halcyon,kf6kjg/halcyon,zwagoth/halcyon,zwagoth/halcyon,M-O-S-E-S/halcyon,M-O-S-E-S/halcyon,kf6kjg/halcyon,kf6kjg/halcyon,M-O-S-E-S/halcyon,emperorstarfinder/halcyon,emperorstarfinder/halcyon,emperorstarfinder/halcyon,InWorldz/halcyon,emperorstarfinder/halcyon,InWorldz/halcyon,zwagoth/halcyon,InWorldz/halcyon,emperorstarfinder/halcyon,kf6kjg/halcyon,M-O-S-E-S/halcyon,kf6kjg/halcyon,InWorldz/halcyon,InWorldz/halcyon,zwagoth/halcyon,InWorldz/halcyon,M-O-S-E-S/halcyon,M-O-S-E-S/halcyon,InWorldz/halcyon,InWorldz/halcyon,M-O-S-E-S/halcyon,zwagoth/halcyon,kf6kjg/halcyon,kf6kjg/halcyon,InWorldz/halcyon,M-O-S-E-S/halcyon,kf6kjg/halcyon,kf6kjg/halcyon,emperorstarfinder/halcyon,zwagoth/halcyon,M-O-S-E-S/halcyon