Peak: improvements for inelastic scattering, etc.

[Janik Zikovsky]

Minor defects and enhancements needed

• 1. Add a constructor that allows to set hkl and goniometer rotation matrix.Also initialize the rotation matrix to unity if not set otherwise
• 2. In getWavelength check E_initial=E_final
• 3. In getTOF, you should not assume elastic scattering. tof=d_samp_source/v_initial+d_sample_detector/v_final
• 4. Point 3 is especially important for getting qlab
• 5. In QSampleFrame you need to multiply with the inverse (or the transpose if you want to. they are the same for a rotation matrix)

[Andrei Savici]

(In [12040]) small changes for Peak object. refs #2870

[Andrei Savici]

(In [12061]) small changes for Peak object. refs #2870

[Andrei Savici]

(In [12064]) Some doxygen warnings in Peak. refs #2870

[Andrei Savici]

(In [12091]) Fixed tests. Made sure you cannot use singular matrix for goniometer. There is no check if it's a real rotation matrix. Fixes #2870

[Janik Zikovsky]

#1: Yes. #2: Returns final energy, that's okay. #3: Yes. #4: Also accounts for ei/ef #5: Done.

[Stuart Campbell]

This ticket has been transferred to github issue ​3717