Useful in compact designs to know hos to place a via during track creation.

Eeschema: code cleaning

some cleanup.

Solved a minor bug in Search in lib command when attempt to search a component name in non loaded libraries

Now uses only an unique default pen size for plot/print and draw items (see changelog)

* Applied sheet reference plotting patch from Lorenzo.
* Fixed bug in Pcbnew plot dialog, ignore user scaling when controls are disabled.

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Minor others changes.