Amaury Denoyelle fa41cb6792 MINOR: tools: support for word expansion of environment in parse_line
Allow the syntax "${...[*]}" to expand an environment variable
containing several values separated by spaces as individual arguments. A
new flag PARSE_OPT_WORD_EXPAND has been added to toggle this feature on
parse_line invocation. In case of an invalid syntax, a new error
PARSE_ERR_WRONG_EXPAND will be triggered.

This feature has been asked on the github issue #165.
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