[1.4.x] Post release version bump.
[1.4.x] Added dates to release notes.

Backport of 0fd23545db from master
[1.4.x] Fixed #23431 -- Allowed inline and hidden references to admin fields.

This fixes a regression introduced by the 53ff096982 security fix.

Thanks to @a1tus for the report and Tim for the review.

refs #23329.

Backport of 342ccbd from master
[1.4.x] Fixed #20036 -- Improved GEOS version string parsing

Thanks chikiro.spam at gmail.com for the report.
[1.4.x] Fixed #23499 -- Error in built-in template tag "now" documentation

Backport of ab8248361e0a7b4fc7684eaaa5891e16b8562683 from master.
[1.4.x] Required numpy < 1.9 for tests; refs #23489.

Backport of 4743a94429 from stable/1.7.x
[1.4.x] Fixed #23604 -- Allowed related m2m fields to be references in the admin.

Thanks Simon Charette for review.

Backport of a24cf21722 from master
[1.4.x] Fixed #23631 -- Removed outdated note on MySQL timezone support.

Thanks marfire for the report.

Backport of 9db3653670 from master
[1.4.x] Added release dates to release notes.

Backport of 9dc782b631 from master
[1.4.x] Bump version numbers for bugfix release.
Merge tag '1.4.16' into 1.4.x-patched

Tag 1.4.16