pynbody/tangos: Version 1.1.0

Bug fixes Fix multiple bugs in earliest(), earlier(..), latest(), later(..) live calculations and related functionality Issue #77, unreliability when cross-linking different simulations (@mrey) Compatibility with Python 3.7 and 3.8 Compute correct contamination_fraction when writing in server mode (@mrey) Fix bug in __repr__ for Links when weight is None Fix bug in property writer, where pre-requisites could be erroneously flagged as not present simply because they were links rather than properties Features The tolerance for considering two timesteps 'the same time' is now configurable within config.py Add ==, = comparison operators to live calculation Added a tool to import AHF merger trees (@tobibu) Add ability to import hostHalo/childHalo from AHF Extent abs() live-calculation function to take absolute value of scalars as well as vector quantitie