[mythtv] Weekslot recording, and an sql-join for mythbackend

[Thor Johnson]

Two more patches:
The first makes an explicit "this timeslot every week" recording
type.  This corrects the probme TNN has with some shows that are
weekly programs that also show up in the same timeslot on a 
different day.

Recordtype 5 is weekslot record, and it will only fire if the
channel, title, timeslot and dayofweek match. (BTW Kudos to
whoever did that SQL query!!).

The tiny patch is to use a Join instead of subquerying the
database for the queryrecordings query.  Just a bit faster.

-Thor Johnson
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