Update configuration for Cygwin test server.
Update flow version.

- fix rev_num.h generating script
Merge branch '1.8.1_patch' of https://github.com/flow123d/flow123d into 1.8.1_patch

Conflicts:
	src/main.cc
Merge branch '1.8.1_patch' of https://github.com/flow123d/flow123d into 1.8.1_patch
Merge branch '1.8.1_patch' of https://github.com/flow123d/flow123d into 1.8.1_patch

Conflicts:
	CMakeLists.txt

Add PYTHON_COPY to release configurations.
Merge branch '1.8.1_patch' of https://github.com/flow123d/flow123d into 1.8.1_patch