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.

 - CACHED_CONTAINER::GetVertices: removed useless and unused function
   which does nothing but tainted the API
 - SHAPE_LINE_CHAIN::Collide( const BOX2I& aBox, int aClearance ):
   removed an outdated function with assert(false)
 - SHAPE::BBox(): fix a small typo in the doc string

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.

Minor fixes: coding style in 3d-viewer and minor code cleanup, and some fixes in bom python scripts, which did not work when a non ascii char (but a valid utf8 symbol) was found in xml netlist. Add comments.

* 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)

The hotkey import/export files have now the extension ".hotkeys"

Footprint editor: set the default footprint text size to 1 mm. Minor cleaning code. Very minor other fixes.

Fix some minor coverity warnings. Fix a bug in pcad2kicad plugin. Scripting: map BASE_SET. Rename some python bom scripts with better names. Fix erroneous comments and add comments

* Add wxTAB_TRAVERSAL to TREE_PROJECT_FRAME ctor.
* Please note that there is still a focus issue when closing a child window (at least on
  windows) that prevents this from being an ideal solution.
* Minor code cleaning.

Eeschema: Fix a (minor but annoying) bug detected by coverity which prevent Eeschema to draw components in "fast mode" (i;e. without pin texts) when they are moved, due to a draw parameter which was incorrectly used.
Move items rework: enhancements: for some items (sheets, components, bus entries) the mouse cursor is no more wrapped to the anchor. For large symbols, this is better: they are more easy to place.
There is also a change when starting a move item command: the full screen is redraw, and therefore there is no artifact due to the XOR draw mode.
Some other minor coverity fixes (uninitialized members).