lalinference: removed remaining references to currentParams in init
TimeSeriesInterp:  expand the documentation
TimeSeriesInterpTest:  remove cruft
lalinference_mcmc: added myself as an author
TimeSeriesInterp:  replace Lanczos window with Welch window

- Welch window can be recomputed each time the kernel is regenerated which
  improves the accuracy of the result more than is lost using the Welch
  window instead of the Lanczos window
TimeSeriesInterpTest:  add a short-kernel accuracy test