subscriptions 6.x-1.x-dev

This is the port of Subscriptions 5.x-2.2 to Drupal 6 — it has BETA quality, i.e. we do not recommend installing it on a production site, but we invite you to test and provide feedback in the issues queue.

Changes since 6.x-1.x-beta1:
- #284442: Fix call to undefined function language_initialize() for sites that have only one language.
- #282840: drupal_html_to_text() is now part of core, no more need for the HTML_to_text module.
- #278107: Check for the existence of the {mail_edit} table before attempting to remove entries in subscriptions_uninstall().
- Don't use drupal_goto() in a form submit handler.
- #273960: Fix multi-language support.
- #273537: Allow translating the entries in the 'Type' column of the Overview page.