notifications 5.x-1.0-beta2

- Added new mail2web module
- Added Notifications Lite module, extra simple notifications API.
- Removed notifications_default_send_method setting and updated forms accordingly.
- Messaging method default now shared with messaging module. Simplified user settings.
- Disabled form control when there's only one sending method or send interval
- Fixed bug: notifications_queue not respecting 'Notify poster of own posts' setting
- Patch for PHP 4 compatibility by markus_petrux, http://drupal.org/node/222794
- Function notifications_queue() now returns event object
- Internal API change: notifications_message_part() now takes optional event as last argument
- New feature for message composition: texts may be predefined in $event->text;
- Support for empty message parts, using MESSAGING_EMPTY constant