Change the default for the automatic check to yes.
Merge branch 'master' of github.com:lksoft/MailPluginManager

* 'master' of github.com:lksoft/MailPluginManager:
  Update UUIDs
Change the handling of the updates to use new Sparkle , add my specific loading for the prefs into Sparkle and handle cases for insecure Sparkle updates better in MPM.
Merge branch 'master' of github.com:lksoft/MailPluginManager

* 'master' of github.com:lksoft/MailPluginManager:
  Change the default for the automatic check to yes.
Change the "Remove" button text to "Delete" for clarity.
Ensure that update probes are readonly for everything.