"replace" as the 2nd argument. This allows a simpler 'tag add
<command> <value>' than the existing awkward 'tag <command>
"[tag <command>]; <value>'. Using "add" also helps avoid
mistakes like one that was in the code for a long time which
overwrites one of the helper window callbacks. With this done,
added some additional callbacks to the "library manager" to
update when a new file is created by "select save" or "writeall".
Also added "Refresh" buttons to these windows, just in case.
Implemented a zoom function on the mouse scroll wheel when the
Control key is pressed. This is a stop-gap for a problem with
overriding button bindings that re-establish themselves when the
tool (box, wiring, etc.) changes. That needs to have a more
comprehensive solution (such as tool-specific bindings).
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