1.4

  - reinstall button

    does the same as uninstall/install except that it does _not_ delete
   objects that have been created on portal_level (portal_objects)

  - product version info

    added getProductVersion to the API
    shows the version of the products
   for installed products it also shows the version of the prod at install time

  - By Andy McKay

    Remove the except: pass from trying to make a External method, if there is an error in the import log the error to ZLOG. Unfortunately there is a string error we have to try and catch as well. That string error occurs when the module cant be found, so we should ignore that.

  - content type registry support 

    QuickInstaller now also tracks entries in the content_type_registry.

  - if products have been removed from disc, mark them in the installed list as 'removed'

  - added a ChangeLog :)
