In a maven 2 project, if I add a property in the m2 options whose value is
surronded by double-quotes (because the value contains spaces) the invocation of
m2 fails just as if the quotes where removed.
For instance if my options are: install -Dmy.property="my value", then m2 fails
because "value" is not a valid goal.

Note that the freestyle projects treat quotes properly.

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Reopen: Issue was reopened because added quote support affects backslashes. Double-backslash now gets collapsed to one.. see comments below.