User is not asked for Mercurial authentication information initially

When running GetComponents without the "-a" (anonymous) option, the user is asked initially for authentication information for any authenticated repositories. However, the Carpet repository is not included in this list. This leads to the authentication prompt much later when Carpet is actually being checked out, and here it is not possible to say "anonymous". I believe the problem occurs on line 846 of GetComponents:

        # if AUTH_URL is defined we want to find the username:
        if (
            defined( $component->{AUTH_URL} )
            and (  $component->{TYPE} eq 'cvs'
                or $component->{TYPE} eq 'svn'
                or $component->{TYPE} eq 'darcs'
                or $component->{TYPE} eq 'git' )
          )
        {

where Mercurial (hg) is not included in that list. The attached (untested) patch adds hg to that list, but I don't know if this is sufficient to fix the problem.

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