Improve option definitions
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		@@ -186,18 +186,18 @@ def parseOpts():
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	general.add_option('-r', '--rate-limit',
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			dest='ratelimit', metavar='LIMIT', help='download rate limit (e.g. 50k or 44.6m)')
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	general.add_option('-R', '--retries',
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			dest='retries', metavar='RETRIES', help='number of retries (default is 10)', default=10)
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			dest='retries', metavar='RETRIES', help='number of retries (default is %default)', default=10)
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	general.add_option('--dump-user-agent',
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			action='store_true', dest='dump_user_agent',
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			help='display the current browser identification', default=False)
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	general.add_option('--user-agent',
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			action='store', dest='useragent', help='specify a custom user agent')
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			dest='user_agent', help='specify a custom user agent', metavar='UA')
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	general.add_option('--list-extractors',
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			action='store_true', dest='list_extractors',
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			help='List all supported extractors and the URLs they would handle', default=False)
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	selection.add_option('--playlist-start',
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			dest='playliststart', metavar='NUMBER', help='playlist video to start at (default is 1)', default=1)
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			dest='playliststart', metavar='NUMBER', help='playlist video to start at (default is %default)', default=1)
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	selection.add_option('--playlist-end',
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			dest='playlistend', metavar='NUMBER', help='playlist video to end at (default is last)', default=-1)
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	selection.add_option('--match-title', dest='matchtitle', metavar='REGEX',help='download only matching titles (regex or caseless sub-string)')
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@@ -373,8 +373,8 @@ def _real_main():
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		except (IOError, OSError), err:
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			sys.exit(u'ERROR: unable to open cookie file')
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	# Set user agent
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	if opts.useragent is not None:
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		std_headers['User-Agent'] = opts.useragent
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	if opts.user_agent is not None:
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		std_headers['User-Agent'] = opts.user_agent
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	# Dump user agent
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	if opts.dump_user_agent:
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