Allow using alternative url field in "l_FollowLocation" tag

I was trying to make changes to in-link/elements/visit_link.elm.tpl, where the only code is:

<inp2:l_FollowLocation field="Url"/>

but my changes for "field" values weren't working... I've removed completely [b]field="Url"[/b] from the tag, and it still work the same, because "Url" field is hardcoded int FollowLocation tag.

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TODO:

1. make l_FollowLocation tag use given field name, to read url from it
2. pass url field into "visit_link.elm.tpl" template (gives ability to control used url field during link list printing)