Patient Orientation Modifier is not extracted from RDSR

[Luuk]

Patient Orientation Modifier is missed because we're looking for it at the same nesting level as Patient Orientation, but it is one nesting level deeper (as it is a concept modifier of Patient Orientation).

[Luuk]

Refs #561 Extract Patient Orientation Modifier correctly

Made the extraction one nesting level deeper (as it is concept modifier of Patient Orientation)

→ <<cset 3086b2d75998>>

[Ed McDonagh]

Adding ref #561 to changes

→ <<cset dac898630430>>

[Ed McDonagh]

Merged in Issue561PatientOrientationModifier (pull request #129)

Fixes #561 Extract Patient Orientation Modifier correctly

Tested import using file previously provided. @LuukO it would be good to have version with just a few events in to add to the automated testing. Adding this one would make the tests take too long!

→ <<cset 8ea8fd6b32a4>>

[Luuk]

@edmcdonagh you can remove this test file and use RF-RDSR-Philips_Allura.dcm for the purpose. It is the same concerning this issue.