[BUG] AmberRst7.box_angles() objects have the wrong units

[lohedges]

Angles returned by the box_angles() method have length units:

In [1]: import sire as sr

In [2]: s = sr.load_test_files("ala.crd", "ala.top")

In [3]: rst7 = sr.legacy.IO.AmberRst7(s._system)

In [4]: rst7.box_angles()
Out[4]: ( 90 Å, 90 Å, 90 Å )

In [5]: rst7.box_angles()[0].angle()
Out[5]: 0

In [6]: rst7.box_angles()[0].length()
Out[6]: 1

[chryswoods]

Good spot - this is in the python layer only, but is definitely annoying. The Vector class has some Python overrides that add length units to its components. I'll need to either remove these for this class or create a typed-vector interface for angles. For now, use .value() to get the raw doubles representing the angles in degrees.

[lohedges]

Great. I assumed it must be a Python layer thing since I've never had an issue with parsing anything, or creating spaces based on the box information. As suggested, I'm currently using .value(), then manually converting to degrees 👍