timeseries.io.cache: remove threading code

    - it's rubbish and shouldn't have ever been written
timeseries.io.gwf.lalfr: added resampling

    - brings lalframe input inline with framecpp
    - allows multiprocesses resampling
timeseries.io.cache: housekeeping

    - renamed some functions for cleanliness
    - remove registry force, shouldn't be needed