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Major:
* Action API (API v3) (beta version) provides powerful RPC-style API to CKAN data (1335)
* Documentation overhaul (1142, 1192)
Minor:
* Viewing of a package at a given date (as well as revision) with improved UI (1236)
* Extensions can now add functions to the logic layer (1211)
* Refactor all remaining database code out of the controllers and into the logic layer (1229)
* Any OpenID log-in errors that occur are now displayed (1228)
* 'url' field added to search index (e9214)
* Speed up tag reading (98d72)
* Cope with new WebOb version 1 (1267)
* Avoid exceptions caused by bots hitting error page directly (1176)
* Too minor to mention: 1234,
Bug fixes:
* Re-adding tags to a package failed (since 1.4.1 in Web UI, 1.4 in API) (1239)
* Modified revisions retrieved over API caused exception (since 1.4.2) (1310)
* Whichever language you changed to, it announced "Language set to: English" (since 1.3.1) (1082)
* Incompatibilities with Python 2.5 (since 1.3.4.1 and maybe earlier) (1325)
* You could create an authorization group without a name, causing exceptions displaying it (1323)
* Revision list wasn't showing deleted packages (b21f4)
* User editing error conditions handled badly (1265)