pcbnew: fix wxWidgets 2.8 compatibility issue (temporary fix, still have a minor cosmetic issue), and add missing file.

Rework on layer box selector, to use it in dialogs (currently the active layer selector, the layer pair selector and the dimension editor dialog.
This rework solves Bug #1214545.
Work in progress: many dialogs do not yet use the layer box selector.

Use via layers which are determined in only one place, this is a cheap trick to support blind vias in the export.

Add <aliases> and <alias> to generic netlist XML format, required by new bom_csv_grouped_by_value.py support.

Significantly enhance the bom_csv_grouped_by_value.py BOM generator.
IMO it at this moment, the best BOM production tool for KiCad.

* Fix Bug 1219239 - EESCHEMA crashes when editing a template field in libedit through the context menu

Pcbnew: Redesign layer selection and layer pair selection (give them a look near the Layer selector in toolbarr)

Pcbnew:  enhancements for blind/buried vias placement ( separate keys to add a buried via or a through via), and save" blind/buried vias allowed" option in .kicad_pcb file
Minor code cleaning.
Allows compiling under wxMSW-2.8.12, only for test purposes, because there are serious bugs for Kicad under wxWidgets version < 2.9.3.  (compil warning generated for these versions)

Pcbnew: enhancements for blind/buried vias palcement, and save blind/buried vias allowed option in .kicad_pcb file

Add pl_editor_doc.icns, from Orson. Fix Bug #1217504  (bad look of Module Properties Dialog, 3D fields).
Add Dick's workaround in plot_board_layers.cpp to try to avoid crash in solder mask calculations, due to a bug in boost::polygon, in resize function.

Pcbnew: speedup netlist read, when some footprints are not found, by caching the non-existent footprint names, which are searched only once in libs.
When a non existent footprint is used by many components, this footprint was previoulsy searched in libs for each component, which is very time consumming.

Pcbnew: read netlist enhancements: add option to remove single pads nets, add enforce tests to report non existing netnames in zones.
Fix also some very minor errors in comments.

Pcbnew: add more test when reading a netlist file: verify if all pads found in netlist are found in corresponding footprints (no missing pads).

Pcbnew: Fix a bug when reading a netlist which forces pcbnew to read lib files to find a footprint even if the right footprint is already loaded (which explains the long time to load netlists)
Netlist dialog: add option to report only most important messages. Useful for large boards.
class REPORTER: add features to allow a basic message filtering (flags to report all/warning/error messages)
Fix Bug #1214599 ( tools are deselected on Move command )

Lay basis for a more full featured usage of boost, including compiled libraries such as unit_test_framework, system, etc.  Move headers now into boost_root/include/boost/.

Others: fix very minor issues.

* Fix the last parts of Bug 1204712 by removing DateAndTime from library file and documentation file formats. They weren't being loaded anyway.

- Comment fix

* Use a regular expression to enforce more stringent bus label testing.
* Add validator to edit label dialog to prevent space character from being
  used in labels.

Pl_Editor: fix copyright in files. Enhancement when creating new items.

REMOVE: vias from specctra DSN export which are not in a netclass.  Use only netclass based via sizes in freerouter.
Some of the vias in the class-less list were setting the drill hole size to zero and this made no sense to freerouter.

Replace the wxFilePickedCtrl in Option Page dialog by an usual wxButton + wxTextCtrl, because under wxWdgets 2.8.12 the look and the behavior is very different between Windows and Linux.

Replace the wxFilePickedCtrl in Option Page dialog by an usual wxButton + wxTextCtrl, because under wxWdgets 2.8.12 the look and the behavior is very different between Windows and Linux.

dialogs which allow editing of component properties.  The button
is active when the table row cursor is on the DATASHEET field only.
When active, and your datasheet is a URI, then your default
browser will be launced to show that datasheet if it can find it.
This incentivizes use of http:// links for datasheets.