0.12.1: bug-fix release for gwpy-0.12 Bug-fixes (including package, unit test, and documentation updates): - [#891, #899, #903] reverted auto-cropping of output series for `TimeSeries.whiten` - [#900] moved `TimeSeries.shift` to `Series` - [#904] fixed bug in writing `FrDetectors` to GWF with `lalframe` backend - [#882, #884, #898] misc bug fixes for `gwpy.cli` - [#906] updated license to GPLv3+ - [#898, #908] misc documentation improvements