Add script to make a footprint library table from the KiCad Bazaar library repository, either in s-expr or CSV format.  Add also the generation of such tables as of today.

This is limited to round tripping the lines of commented text in the
loading and saving to disk through PCBIO::Format() and PCBIO::Parse().
No editing of the comments is given.

The bug was revealed on re-opening the saved version of a file imported by pcad2kicadpcb.

Pcbnew: netlist dialog: add silent mode option, and tool tip to the 2 options (dry run and silent mode)
dialog_display_info_HTML_base: derived now from dialog_shim.

Bitmap2component: add export for .kicad_mod new footprint file format, and export polygon descr for page layout description (.kicad_wks file)

Eeschema: Add dialog and utilities (help files ...) to create BOMs from generic netlist, using python scripts or xsltproc+style sheet.
Remove dead code relative to old BOM generation.
Rename witha  more explicit name bom-example?.py , fix some issues and move them from script/bom-in-python/ky to script/bom-in-python
Rename ki.py utility to more explicit  ky_generic_netlist_reader.py

* Do not search for footprint when no footprint is defined for a component
  in the netlist.

Rename invoke_a_dialog.h.  Code an alternate implementation for std::string BOARD_ITEM::FormatInternalUnits( int aValue ), for verification.

Cvpcb: Bug fix: Select previous free component crashes Cvpcb when no previous free component found, and both Select next and  previous free component where not working very well.

* Fixed status bar update bug that caused the selected footprint information
  to be overwritten.
* Remove unnecessary SetFocus() calls in list control OnChar() handlers.

   and various DIALOG classes called from top frames.  See comments in
   {eeschema,pcbnew}/invoke_a_dialog.h.
*) Move some dialog classes into *.cpp files from *.h files.
*) void SCH_EDIT_FRAME::OnErc( wxCommandEvent& event ) was opening the modeless
   ERC dialog more than once if icon was clicked more than once.
*) Remove BOM stuff.

Plot files : fix Bug #1188664  (full filename instead of short file name, and swapping between sheet path and file name)

* Add option to MODULE::GetPadCount() to exclude non-plated through holes.

Mainly for testing purposes: page layout: if the environment variable KICAD_WKSFILE points a S expr page layout descr, this descr is used instead of internal descr.
Therefore one can use a custom page layout and title block.
Eeschema, dialog edit component: minor enhancement (the last selected notebook page is remembered during a session)

page layout: if the environment variable KICAD_WKSFILE points a S expr page layout descr, this descr is used instead of internal descr. Mainly for testing purposes.
Eeschema, dialog edit component: minor enhancement (the last selected notebook page is remembered during a session)

Eeschema, dialog netlist: fix a bug when removing a plugin panel, when is is not the last.
dialog netlist:Add a predefined command string for python scripts, when creating a new netlist plugin entry.

* Change filtering from single selection to logically and each filter type.
* Remove clear filtering button and logic.
* Filter buttons now behave as true toggle buttons.
* Improve list control pane focus following when using arrow keys to change
  list pane.
* Remove unused parameters from list box constructors.
* Make tab key behave like right arrow key when moving focus to next list
  pane.
* Make list pane focus wrap around to next or previous control.
* Simplify component list filtering code.
* Improve status bar updating.
* Tell Bazaar to ignore .downloads-by-cmake instead of downloads-by-cmake.

fix libeditframe.cpp, which in release build would not show multipart text in listbox.  dialog uses DIALOG_SHIM.