Warn when resuming an external mode lacking resume(). For modes
that actually doesn't need any restore handling, add a no-op
resume() function to mute the warning.
Add a restore() function for KDEPaste. Very slow but better than nothing.
Merge branch 'bleeding-jumbo' into memdbg

* bleeding-jumbo:
  Add a restore() function for KDEPaste. Very slow but better than nothing.
  Warn when resuming an external mode lacking resume(). For modes that actually doesn't need any restore handling, add a no-op resume() function to mute the warning.