[MERGE] 1.14 formats

[Ian Clatworthy]

Lack of EOL conversion support is blocking adoption of
Bazaar in some key projects we're keen to see move across.
There are two essential pieces needed to remove this blocker:

1. Integrated eol conversion support
2. A production-quality format supporting content filtering.

A patch for the first of these was put up for review last night.
This patch delivers the second. Some other patches (e.g. custom rules)
would be nice as well, though they aren't strictly needed like
(1) and (2) are.

For the record, 1.14 = 1.9 + "I support content filtering/views" flags.
Having written the end-to-end tests for EOL handling last night,
I'm now confident that the *format* is production strength and
that only minors bugs, if any, exist in the new features enabled
by those flags.

Of course, we could delay usage of these features until 2.0 instead of
adding a production format now. I feel that we're better to get them
out there, get user feedback and tweak them if required in 2.0.
As well as allowing projects to switch now (instead of 3 months time
say), this approach will give us a better 2.0 IMO.

BTW, we're still stuck with both 1.14 and 1.14-rich-root for now.
That duality is removed in the pending chk format being developed in
"brisbane-core" so it will be gone in 2.0 (but can't go yet).

Ian C.
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