Cvpcb: Shows a better message when a netlist is not found.

Try to fix Bug #1431391 (Unable to edit pins in Schematic library editor). It happens on XFCE, but also on Unity. This fix works on Unity. (it is due to the fact the dialog is not raised, for an unknown reason, and this bug depend on the way Eeschema and Libedit are run).
Add Ctrl+E hotkey in eeschema to edit a component with Libedit (similar to pcbnew Ctrl+E hotkey)
As usual, fix a few minor coverity warnings

Remove a few coverity warnings. Fix some comments which were incorrect, due to the changes in code. Remove not compiled code (kept as comments), now outdated or useless
legacy plugin: better compatibility with old brd files (current track width and current vias size, stored in SETUP section, were not read from file and incorrectly set)

Eechema, libedit, pin dialog editor: show pin texts  in pin  preview canvas.

Fix minor bug #1429990 (3D viewer shows hidden footprint graphic texts ). Fix minor coverity warnings (not initialized members and dead code)

Fix a few minor coverity warnings.

Moved "Place Target" and "Place Module" tools from DRAWING_TOOL to PCB_EDITOR_CONTROL (to avoid placing modules in the footprint editor).

Fix issue #1429665 (eeschema doesn't recognize .sch file when the LIBS section is empty. But the section is not used, just a comment, therefore can be empty).
Very minor other fixes.

Eeschema now uses dashed lines for graphic lines (to be consistent with plot functions and toolbal icon).
Fix an old bug in some envionments which warp the mouse on a bad monitor when opening eeschema, pcbnew and some other windows, only noticeable guys who are lucky enough to have more than one monitor.

Minot fixes: Minor coding style issues fix (tab -> spaces). Add missing GetClass to all classes derived from EDA_ITEM. Make debug method Show() only compiled in debug mode.

* Fixed incorrect parameter ordering in gEDA footprint library parser
  which read drill diameter, pad clearance and solder mask clearance.
* Fix FindOpenSSL.cmake version detect bug which was exposed by OpenSSL
  version 1.0.2.

Fix some coverity and cppcheck warnings (most are very minor issues: not initialized members and initialized but not used variables)