Tiskitpy

- Added channel identification by ``tiskitpy_id``, which includes cleaning
information.
The ``tiskitpy_id`` for uncleaned data is the ``seed_id``.
- Added class CleanedStream and revised the guts of several classes, including
renaming ``SpectralDensity.channel_names`` to ``SpectralDensity.ids``.
- CleanRotator class now has a property `variance_reduction` which gives the
variance reduction obtained during __init__()
- Added `SpectralDensity.plots()` and `.plots_coherences()`, to compare
multiple `SpectralDensity` objects

Rewrote tracking of cleaning steps, a lot of internal work, including
new classes, but should be invisible when using the command-line codes
and mostly invisible when using the API.

- Renamed TransferFunction to ResponseFunction, changed internal and method
names to correspond:

- .response -> instrument_response
- .frf -> .value
- .frf_wrt_counts -> .value_wrt_counts
- SpectralDensity.channel_response -> SpectralDensity.channel_instrument_response
- SpectralDensity.put_channel_response -> SpectralDensity.put_channel_instrument_response
- SpectralDensity.__init__(response=) -> SpectralDensity.__init__(instrument_response)
- Internally renamed `tiskit` to `tiskitpy`

- Decimator.decimate() now returns same data.dtype by default
- TransferFunction now accepts wildcards for out_chan names
- Added 'outfile' to TransferFunction.plot()
- Added TransferFunction.put_response()

Change `MANIFEST.in` to recursively include subfiles/directories of decimate/

Fix `TransferFunction` errorbar plotting bug