content_taxonomy 7.x-1.0-rc1

This includes a number of fixes since beta2, most notably on the upgrade path from D6. Additional testing, and some documentation, is required before I'd be happy tagging this as 1.0, but it's almost there.

The full changelog since v7.x-1.0-beta2:

• #1373716 by Owen Barton: Added hook_disable() to disable the custom field widget and prevent site from breaking.
• By mh86: Added hook for altering the term tree callback used in the allowed values function.
• By mh86: Added new submodule that supports the Entity Translation mode for taxonomy terms.
• By mh86: Fixed translated term names on initial autocomplete deluxe suggestions.
• #1208164 by skein, mrded, rbayliss, drzraf, DamienMcKenna: Fix field migration.
• #2580251 by michel.settembrino, DamienMcKenna: Added EntityReference autocomplete support.
• #2379611 by justanothermark: Wording change on autocomplete error message.
• #1160146 by moskito: Added ActiveTags support.
• #1395276 by bigjim: Fixed options field on migration.
• #2348363 by james.williams, DamienMcKenna: Only alter field instances for content_taxonomy fields.
• #1558050 by bdimaggio, DamienMcKenna: The 'array_parents' element might not exist.
• #1643858 by DamienMcKenna, hatuhay, BrightBold, marthinal, benjy, mikhailian, MakaziMtingwa, zhilevan, klidifia, pappuksingh, cameronbprince: Fix invalid default values.