Add an "External" recorder to Myth.  This allows myth to read in a Transport Stream via a pipe from an external application.  See http://www.mythtv.org/wiki/ExternalRecorder for documentation.

In upstream master as:
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d4c425cb2e94f35fa208d332aeed0ccd9ff0fcb8
0732c92dd2ffc5c77473e5a225eaf5d734110798
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ea9248bd92c26df243c591a21d15b74841d30d6c
52eb16fa7a77de4c8b8cd3e9427c603bd03567e8
b10571c45506b201f8bcdb9d06ac663f478cca00