Improve continuous integration.

- add windows32 platform
- introduce PLATFORM_NAME in config.cmake
  to name inastall packages
- publishing script prepare_to_publish
- Flow123d_git_info - retrieve git information and
  set flow123d version
- all version informations are taken from branch name
- rev_num.h generated from template file
Merge branch '1.8.0_master' of github.com:flow123d/flow123d into 1.8.0_master