Remove empty list and duplicated opal-font-lock-special_operators and opal-font-lock-special_constants

* Add new file from Hui Zhang with B-field and adaptive limits (possibly closer to original)
* Fix some comments
* Adhere to coding style
* Add BANDRF script to CMake
* Remove old script with hardcoded values to reduce duplication
* Make Efield and Bfield input optional

See merge request !281

- the corresponding methods are not used and have been removed to fix
  this issue.

Implements tracking bunch back in time; replace queues for time step size, num time steps and zstop with class that stores all these informations in a list; let the SOURCE element absorbe all particles in case of back tracking; disables automatic centering of FROMFILE distributions;

- use std::cout instead of Ippl's Inform class
- fixes for H5hut version 2

Use different chains of random numbers on each core of a parallel run in CollimatorPhysics. Furhtermore fix simulation time after all particles were in material and fix spurious structure in longitudinal position with period length of time step that was present after passage of material.

bugfix: increase population by number of worker groups; arguments as members to avoid multiple getarg calls

extend multi-slit language to support bitmap masks; Binary pbms not parsed correctly yet, working on it

IPPL/FFT cleanup:
- header added to file
- obsolete files removed
- line indentation fixed
- required functions and macros moved from c_utils.{c,h} moved to fftpack.cpp

renaming Collimator to CCollimator where C stands for cyclotron; all other collimators are implemented using FlexibleCollimator; This also fixes #224