DATACMNS-448 - Added infrastructure for 'deleteBy' queries.

Add keywords 'delete' and 'remove' to PartTree indicating presence of delete intend.

Original pull request: #72.
DATACMNS-448 - Added infrastructure for 'deleteBy' queries.

Add keywords 'delete' and 'remove' to PartTree indicating presence of delete intend.

Original pull request: #72.