fterms inconsistency

[martinspetlik]

fterm and other files in docker-config/package/project/src/linux/ which are used in release version differ from files in
flow123d/bin/

Moreover, released files do not work properly. For instance, ./bin/flow123d should start flow123d, but it just starts the docker container, ...

[jbrezmorf]

Move flow123d/fterm into this repository and use it as submodule in the main repository.
Keep this and simplified installation fterm in sync, and in sync with the entrypoint.sh.

Consider moving jenkins configuration to this repository .