.time: bugfix: work with CRINEX

sp3a add format

v1.16.0

ci: condense workflows

add missing test data .bz2 file

ci: add timeout

remove unneeded type hint cast

doc

update url

don't crash on truncated files

allow pandas >= 0.25 by converting datetime64[ns]

This undoes the pandas < 0.25 set in 6993bed.
The issue was that xarray.*.to_netcdf() needs datetime64[ns] but Pandas >= 0.25
started using dtype('O'). This changes converts to datetime64[ns] when using .to_netcdf()

vers

obs2: max per-system SV up to 36 for Galileo (thanks @nmayorov #47)

doc [skip ci]