Fix some notices, add more documentation, a=chris

Author Chris Pollett <chris@pollett.org>
Author date 2021-09-19 01:Sep:th
Author local date 2021-09-18 18:Sep:th -0700
Committer Chris Pollett <chris@pollett.org>
Committer date 2021-09-19 01:Sep:th
Committer local date 2021-09-18 18:Sep:th -0700
Commit 4e933ff0bf3983944d5cab31b759ce0b33f13e7f
Tree e296a3b6945be037ef4ccf5d79bdc57e5e039379
Parent 35642a012d32b0bc0a91fbe37454f63fbc70e247
Fix some notices, add more documentation, a=chris
Affected files:
src/library/BPlusTree.php
src/library/IndexDocumentBundle.php
src/library/LinearHashTable.php
src/library/PartitionDocumentBundle.php
src/models/GroupModel.php
src/models/ParallelModel.php
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