- MagneticFieldEquation
- DormandPrince45 - Stepper
- RkIntegrationDriver
- fieldConstants.h with kB2C, delta_intersection parameters
- fieldPropagatorRungeKutta : new class for use by electrons.cu, used in new Example14

More:

Example15: field propagation using Runge-Kutta.  Based on Example13 otherwise.

Tests - unit test test_magfieldRK.cpp
  Simple checks for equation, stepper and driver classes
  Driver: check version of Advance and V1 (old)
  Checks driver vs helix results (on cpu).

Details:
--------
RkIntegrationDriver
   Introduced new Advance method.  Using AdvanceV1 as backward compatible.
   Enabled used of RK classes with double integrands (field remains float.)

 PrintFieldVectors: auxiliary methods, initially host-only
 Changed VECCORE_ATT_HOST_DEVICE to __host__ __device__

example15: Added ability to print Track info
           check result of RK integration in electrons.cu
           report differences
           Optional argument for Bz field value.
           Use TrackML as default geometry.

…bugging)

Took revisions from Example13/electrons.cu

  - electrons.cu
  - example15.cpp
  - example15.cu
  - example15.cuh
  - example15.h

Changed fieldPropagatorRungeKutta.h to suppress 'id' in argument

…teStepAndNextVolume

RkIntegrationDriver: small cleanup

…n (curvedStep > 0)

…ng from fpConstBz)

…n printing.)

…s RK.

… flip side if failing

After a maximum number of failed (zero) steps, reducing the step size each time,
accept that the track will not cross the boundary, and flip it to the other volume,
which it is apparently entering (or never left.)

…field/inc/CompareResponses

…fety in args

boundary;

fieldPropagatorConstBz::ComputeStepAndNextVolume
- Optional defaul values in interface (at compile time)
- Protected some verbosity using if(verbose)
- Added some optional verbosity

Both of these are to be trimmed / refined.

…puteNextStepAndVolume

Enable defaults for the last 3 arguments of ComputeNextStepAndVolume

…arg is const

Safety was const in ComputeStepAndNextVolume implementation only - added it to declaration.

…rop...