Merge branch 'master' of https://github.com/freeopcua/freeopcua
Create directory for log file during installation. Fail daemon if unable to open log file.
Refactored default place of configuration files directory is used during starting executables. Now it contructs from --prefix.
Clear clients at server shutting down. There was a crash.
Merge pull request #40 from treww/master

Clear clients objects to avoid crash. Fixed taking of configurations files from --prefix path.