v0.8.8

Version 0.8.8 of PINT. Contains many improvements to the GUI as well as many other fixes.

What's Changed

• Report the observatory when TEMPO/TEMPO2 needed. by @aarchiba in #1236
• Convert a cluster into a flag by @dlakaplan in #1234
• Fix DMDATA output for non-pint format by @dlakaplan in #1230
• Add warning when using A1DOT with DDK models by @dlakaplan in #1176
• Use EQUADs and EFACs in WLS fitters by @aarchiba in #1244
• Fixes error during testing by @dlakaplan in #1251
• Make ephemeris loading more robust (and work on our CI) by @aarchiba in #1254
• PINTk improvements by @dlakaplan in #1249
• Keep Kopeikin corrections in ECL coordinates by @dlakaplan in #1202
• Improve clock file handling by @aarchiba in #1239

Full Changelog: 0.8.7...0.8.8