Minor Fixes And Optimizations

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1. In iport_from_origin() if we don't find a match (which is normal for
   ports that are not yet installed) then return immediately.
2. A little more white space after the user input for --check-port-dbdir
3. In check_for_updates() if a port has moved we should also check for
   an +IGNOREME file before forcing the update.
4. For distfile fetching:
   a. Limit the scope of some of the variables
   b. If a distfile has a / in the file name creation of the flag file
      for background fetching will fail, so swap that for a _ instead.

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