ODF 1.2 part 3, 18.3.1 angle, says "An angle, as defined in §4.1 of
[SVG]" and "If no unit identifier is specified, the value is assumed to
be in degrees."

Unfortunately OOo could only read and write 10th of degree here.

See also https://issues.oasis-open.org/browse/OFFICE-3774

As the first step towards fixing that, implement the import for
draw:angle values with an angle unit identifier, but leave the import
as-is if the angle identifier is missing.

Change-Id: Ib88d417c03998ebcfc569b01492f0e1f851bbc85