[web] allow configuration of the Content-disposition value The `set_content_type` function now takes and optional `disposition` parameter to control the value of this HTTP header. Use of `Content-disposition: inline` with a filename parameter are valid, so the presence of filename does not allows to choose between `attachment` and `inline`

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import ConfigParser

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try:

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    undo_actions = config.cfgfile_parser.get('MAIN', 'undo-support', False)

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except ConfigParser.NoOptionError:

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    pass # this conf. file was probably already migrated

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else:

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    config.global_set_option('undo-enabled', bool(undo_actions))