Add note about global variables in help text.
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## message either because you are reading the source code, or you have called
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## the script in command line with the --help option.
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##
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## Note: the options and arguments are also available as global variables in
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## current version, but their use is discouraged and is supposed to be
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## eventually removed.
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##
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## This script can be used from Bash scripts as well. If the $from environment
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## variable is set, that will be assumed as the source Bash script from which to
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## parse the documentation and the provided options. Then, instead of parsing
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