- the buliding and packaging of the GIR files isn't working, this might fix it.

- note:  this patches some elements that haven't been ported yet

- don't call function with invalid timestamp

- remove reference to python elements and to interleave plugin
- update name of gstreamer python bindings RPM
- don't source gstenvironment.sh in .spec
- bump minimum required gstlal and gstlal-ugly for ER9

- comment out headers associated with not-yet-ported elements

- but disable all python elements

- still broken, but need ER9 release

- was harmless, but leading to puzzling warning messages

- was being printed out after what it was describing, and was probably meant to be printed only if --verbose is set (like other messages produced by this code)

- ensure pipeline is in READY state before calling this function

- also add a comment describing the current state of seeking logic, why it
  is that we have to seek pipelines the way that we're doing it.

- on (most) sink elements so they can be controlled

(I hope)