Pull request #261: Feature/VECTO-1500 multistep user manual

Merge in VECTO/vecto-dev from VECTO/hm_vecto-dev:feature/VECTO-1500-multistep-user-manual to develop

* commit 'e978c96d':
  updated dockerfile for multistep user manual
  added output file
  added addtional images
  added powerpoint presentation containing the images used in the documentation
  extended multistep documentation (added airdrag chapter, new step input chapter, added more details in other chapters)
  updated header
  use different docker image with older pandoc version
  Added multistep tool documentation (WIP)
  Added Docker file and scripts to build documentation html using docker