[headers] Remove author and date headers (keep only Idiap stuff)

beat/cmdline/algorithms.py

beat/cmdline/cache.py

beat/cmdline/common.py

beat/cmdline/config.py

beat/cmdline/databases.py

beat/cmdline/dataformats.py

beat/cmdline/experiments.py

beat/cmdline/libraries.py

beat/cmdline/plotters.py

beat/cmdline/scripts/beat.py

beat/cmdline/status.py

beat/cmdline/test/__init__.py

beat/cmdline/test/test_algorithms.py

beat/cmdline/test/test_cache.py

beat/cmdline/test/test_config.py

beat/cmdline/test/test_databases.py

beat/cmdline/test/test_dataformats.py

beat/cmdline/test/test_experiments.py

beat/cmdline/test/test_shortcuts.py

beat/cmdline/test/test_status.py