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Can use the normal webform redirect with two new options: cart and checkout.
Can send emails either on webform submission or checkout. (Uses conditional actions predicate, so the conditions for sending the email at checkout can be modified.)
No longer uses strongarm to add paidevent as a webform type.
Removed version details accidentally added to info files.
Added functionality to work with uc_stock module as requested in http://drupal.org/node/1034628. We now check the remaining stock and don't let people add more registrations than are available. When stock is gone the webform closes.
Props to EclipseGC in #drupal irc for helping me working some of this out.