Prepare for additional changes.
Issue #2580185 by kenwest, DamienMcKenna: Twitter Post form didn't load existing value.
Issue #2580175 by kenwest, DamienMcKenna: Wasn't saving is_global account option.
Issue #2544672 by gurvan: Fixed the classes added to embedded links to match what is recommended/required by the Twitter API.
Issue #2567021 by Andy_D: Missing variables for tweet display via Views.
Issue #2572729 by Ingumsky: The 'class' attribute on links on D6 requires a string.
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.
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