pages, tasks (brython): use set for scripts + common template data: - scripts are put in a set using a namedtuple, this way duplicates can be avoided easily - if `template` is set in dyn_data_common, items there are set in template data if they don't already exist - (brython): common template data is used to set body_onload when there is a root brython script and no page script

import os.path

version_file = os.path.join(os.path.dirname(__file__), "VERSION")
try:
    with open(version_file) as f:
        __version__ = f.read().strip()
except NotImplementedError:
    # pyjamas workaround
    __version__ = "0.7.0D"