Allow tables to contain captions!

Captions were not in the allowed lists of children for tables.
This causes an exception to be thrown if you try to do fixUpInsertion
on a transaction containing captions.

Bug: 58318
Change-Id: I866e015c14e787830c45da93dfed9d2119fb0865
(cherry picked from commit a38b1d9420ffa1db80a99de09d773a8a56986c9c)
Merge "Allow tables to contain captions!" into wmf/1.23wmf6