Pole face rotation for bends

[Jochem Snuverink]

Pole face rotations for bends are currently not implemented.

[Jochem Snuverink]

Will tackle this with Will, Laurie and Jochem

Updated (as of 15-12) Task list:

[X] parser - Jochem
[X] BDSComponentFactory look ahead and behind - Jochem
     [X] add a check for prev/next elements to be drifts
     [X] allow prev/next elements to be of same type (rbend/sbend) with same poleface
[X] angle calculation for sbend/rbends - Will
[X] Drifts -> CreateDrift() - different constructor - Will
[ ] Geometry bends
     [ ] RBend -> Laurie
     [X] Sbend -> splits up carefully -> Will
[ ] Samplers, angled and rotate -> Laurie
[ ] Careful testing on all geometries

[Jochem Snuverink]

This has been implemented, many thanks to Will and Laurie. For any remaining issues, we should open a new issue report.