Integer+fractional day implementation, using double-doubles.
Tests adapted as well.
Basic subtitution of SOFA by ERFA
Fix #1130: Scale and format attributes were not listed in dir()
Remove further references to SOFA, now in docs
Updated changelog
Updated the last iau prefixed function
Add import statement for Table.
Remove sys.stdout

`sys.stdout` is the default. There is no need to explicitly put this.
Adds rudimentary __str__ and __repr__ representations for NDData objects.
Low-hanging fruit optimization in the initializer of Angle
Perform bounds adjustment in the native unit.
Add a test for loss of precision in bounds check
Round up if any of the fields overflow due to low precision
Further refine the rounding up algorithm.
Merge pull request #1311 from mdboom/coordinates/loss-of-precision

Angle bounds checking loses too much floating-point precision
PEP8 fixes for time
Improve precision code docs and use more meaningful var names
Add more tests of precision code
Move precision tests to test_precision, refactor into separate tests
Add discussion of floating point accuracy to Time documentation