Allow nested translation in instrument definition file

[Anders Markvardsen]

Currently allowing for nesting rotations within a <location> element to define the location of a component in an IDF.

Extend this to also allow nested translation using the notation

<location r="1" t="0" p="0">

<trans r="1" t="45" p="0" />

</location>

This has the effect of first translating the component along the z-azis by 1 and then from this position translating according to r="1" t="45" p="0" which correspond to x=sqrt(2) y=0 and z=sqrt(2) in cartesian coordinates.

This feature would for example be useful in the description of the ENGINE-X instrument.

[Anders Markvardsen]

(In [4281]) Allow nested translation using a notation like

<location r="10" t="90">

<trans r="8" t="-90" >

<trans z="2" >

<trans z="1" />

</trans>

</trans>

</location>

Sorted out a bug in LoadInstrument where parameters were not populated correctly. Thanks to Roman for helping with fixing this bug. Refs #1171.

[Anders Markvardsen]

(In [4289]) Included further tests and updated wiki. Refs #1171.

[Stuart Campbell]

This ticket has been transferred to github issue ​2019