By DamienMcKenna: Keep the same default for all uses of twitter_post_types.
Issue #2565907 by anbuece: Undefined variable in twitter_post_field_extra_fields().
Preparing for further changes.
Issue #2561255 by DamienMcKenna: Fixes for tests.
Issue #2561609 by DamienMcKenna: Fixed wrong function used to load a user object.
Issue #2560911 by mkolar: Regression to custom OAuth path functionality.
Issue #2560585 by DamienMcKenna: Follow-on from #2556611 to fix regression caused by D7 patch being applied to D6 module.
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