Adds <filename> to the list of the active offers.
The users will be able to request the file via dcc.get.
If [user_mask] is specified , the access to the file is limited
to the users that match this mask, otherwise the mask will
be automatically set to '*!*@*'.
If the 't' switch is used, the offer will be removed after
<timeout> seconds. If the 'n' switch is used, the offer
will be visible to the oter users as <visible name> instead
of the real <filename> (stripped of the leading path).
<filename> must be an absolute path.
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