scm automatic cleanups.
header (C) fixes
Installer/linux: add support for stop and status commands to the service file generator and simplify the code.
Installer/linux: one external command less in init_template.sh.
Installer/linux: src/VBox/Installer/linux/scripts/VBoxHeadlessXOrg.sh and install_service.sh fixes.
Installer/linux: finish init script generator and add a couple of test cases.
Installer/linux: generic init script template and generator tool.