Removed filename from the BASE_SCREEN class
Scripting support for board plot

Kicad manager: shows now svg files in tree files.
Pcbnew: fix incorrect printing (board out of page) when creating drill map in postscript format ( noticeable mainly for small boards)

  *  serious code cleanup (remove duplicate code)
  *  shows (option in 3D preference menu) the copper items (tracks, zones...)  in 3D, using 35 microns copper thickness.
      However, because there are a lot more3D data to show (roughly 4 times more), this is slower.

connection, no matter if it is originating locally or from the outside
of the host. There is no check in place to discard non-local
connections. The only security against a malicious attack would be
provided by a local firewall, which is not guaranteed to be installed on
every workstation kicad is used on.

I tested this, and a host running eeschema accepts connections on TCP
port 4243 from other hosts on the internet.

A patch to remedy this potentially serious security hole is attached. It
creates the listener on localhost instead. A flag is provided to allow
the creation of sockets on 0.0.0.0 instead, if required. localhost is
the default.

where the 'z' prefix is for size_t arguments.

*) minor beautification

3d-viewer and polygon functions: remove duplicate code about conversion from basic shapes to polygons.

Eeschema: annotate and netlist dialogs: enhancements.
Minor  coding policy fixes and  changes.

All: press ctrl+shift key when moving the mouse allows the graphic cursor to be moved outside the grid.
(useful to place graphic objects, texts in any position, regardless the current grid)

Clipper is, by far, more easier to use than Kbool, and is currently actively maintained.
It is used only to normalize polygons, i.e. to convert self intersecting polygons to simple polygons,
which is not possible with boost::polygon.

Pcbnew: code cleaning in polygon functions