Dialog track options redesigned with wxFormBuilder Alt via drill renamed Specific via drill. Added tips in dialog.

Prevent drawing center from moving when client zoom size exceeds drawing size.
Prevent drawing refresh when zoom level doesn't change to eliminate flicker.

globbing handler. There should be no reason the mask cannot have two '*'s
in it.

The wildcard part of the mask component should be discarded when the user
picks an actual file. For now, we work around this bug by removing the
2nd mask.

minor changes in search paths for help and translation files.

Mandatory in Pcbnew to handle without error metric grid used now for some footprints (BGA, connectors)
Not fully tested