SRW update, CRL, SimEx, bug fixes

• ENH (enhanced):
  • hdf5 I/O efficiency
  • Wavefront visualization and introspection
  • Core SRW library version 2019.08.04:
    • FFTW 3 support
    • OpenMP parallelization in master branch
  • New examples:
    • SPB_day1
    • 02-2017: SOS2016 tutorial examples, including:
      • Interface with FAST-XPD (https://in.xfel.eu/fastxpd/) SASE pulse DB
      • SASE pulse propagation
      • SASE3 grating mono
• ADD
  • Dispersive CRL optical element in WPG propagators
  • Real mirror metrology data in common_data folder
  • Building and distribute WPG in Docker
  • 02-2017: interface to Genesis 2 and 3
  • 03-2017: s2e original BL and reference test for SimEx framework (https://www.eucall.eu/organisation/work_packages/wp4___simex/)
  • 05-2019: Mirror misalignment patch (FLASH II beamline simulations)
  • Crystals/monochromators in Bragg and Laue geometry (WIP)
• Changes
  • Deprecation of Python 2 support, only Python 3 will be supported from 2020
• FIX
  • SimEx issues