Major

Python 2.6 is now unsupported, due to Twisted dropping 2.6 support.
Fix an issue where the value of a reference pointing at a legacy item (ie.
created in an upgrader) could be lost once the upgrade completed in some
circumstances.
All attributes.bytes comparisons based on the LIKE SQL operator (like,
notLike, startswith, and endswith) are deprecated. If SQLite was
compiled with the SQLITE_LIKE_DOESNT_MATCH_BLOBS option (such as the
Debian package does from version 3.10.0-1), these comparisons are always
false; and even when this option is not active, the behaviour of the LIKE
operator with BLOB values is unexpected (the operands are cast to TEXT
before the comparison is done).

Minor

axiomatic start needs to handle some twistd arguments specially;
fix an issue where arguments in the --arg=value form were not detected
correctly (the -a value and --arg value forms were always detected
correctly, so you can use these with older versions, if necessary).