* Removed Pcb_Frame argument from BOARD() constructor, since it precludes
    having a BOARD being edited by more than one editor, it was a bad design.
    And this meant removing m_PcbFrame from BOARD.
  * removed BOARD::SetWindowFrame(), and BOARD::m_PcbFrame
  * Removed the global BOARD_DESIGN_SETTINGS which was in class_board.cpp
  * added BOARD_DESIGN_SETTINGS to the BOARD class, a full instance
  * a couple dialogs now only change BOARD_DESIGN_SETTINGS when OK is pressed,
    such as dialog_mask_clearance, dialog_drc, etc.
  * Removed common/pcbcommon.cpp's int g_CurrentVersionPCB = 1 and replaced it
    with build_version.h's #define BOARD_FILE_VERSION, although there may be a
    better place for this constant.
  * Made the public functions in PARAM_CFG_ARRAY be type const.
    void SaveParam(..) const and void ReadParam(..) const
  * PARAM_CFG_BASE now has virtual destructor since we have various way of
    destroying the derived class and boost::ptr_vector must be told about this.
  * Pass const PARAM_CFG_ARRAY& instead of PARAM_CFG_ARRAY so that we can use
    an automatic PARAM_CFG_ARRAY which is on the stack.\
  * PCB_EDIT_FRAME::GetProjectFileParameters() may no longer cache the array,
    since it has to access the current BOARD and the BOARD can change.
    Remember BOARD_DESIGN_SETTINGS are now in the BOARD.
  * Made the m_BoundingBox member private, this was a brutally hard task,
    and indicative of the lack of commitment to accessors and object oriented
    design on the part of KiCad developers.  We must do better.
    Added BOARD::GetBoundingBox, SetBoundingBox(), ComputeBoundingBox().
  * Added PCB_BASE_FRAME::GetBoardBoundingBox() which calls BOARD::ComputeBoundingBox()

* Replace Eeschema find code with a collector based implementation.
* Fixed a search bug when all subsequent searches of an item would ignore
  the remaining valid child items when an item had more than one child
  item that matched the search criteria.
* Add SCH_FIND_COLLECTOR class to find all items that meet the specified
  search criteria.
* Add SCH_FIND_COLLECT0R_DATA to keep track of information for all matching
  items.
* Use collector to iterate over the list of items that match the search
  criteria rather than trying to start at the last matched item.
* Remove unused searching methods from sheet path and sheet path list
  objects.
* Add replace and replace all functionality to Eeschema find dialog.
* Push matching methods down to EDA_ITEM class so they can be used by
  other derived objects.
* Add method to EDA_ITEM to test if item supports replacing.
* Add flag to find/replace data to support replace feature.
* Disable wild card matching check box when dialog is in replace mode as
  wild card replacement is not supported at this time.
* The usual Doxygen comment and coding policy fixes.

Pcbnew: prepare work on new algos for connections calculations.

the GetPosition() and SetPosition() changes.  It also starts towards making m_Orientation
and m_Thickness fields private with accessors, but does not complete this latter goal.

Pcbnew: Fix issue in Undo/Redo command: for very large boards ( > 20000 items) this command could take a long time. Now fast.

Eeschema: fix crash in intermediate netlist generation when a component has no pins (like logos or images).
Pcbnew: texts in dimensions can be now moved.
Gerbview: fix incorrect number of layers  in export to pcbnew function.

- D_PAD members converted;
- style improved;
- GetPosition made returning value, added SetPosition;
- highly experimental, test it please!

* Fix bug in hierarchical searches using sheet path pointers which are
  destroyed on every search.  Use human readable path as last sheet found
  in test to prevent comparison of deleted pointers.
* Fix a bug in SCH_COMPONENT::Matches() that would prevent searching for
  pins if the search all fields flags was not set.
* Fix a bug in SCH_COMPONENT::Matches() to use the sheet path to perform
  the comparison to the correct reference designator and unit number.
* Fix wrapping in sheet path and sheet path list MatchNextItem methods.
* Push search methods down to EDA_ITEM object so advanced searching can
  be performed on all items derived from EDA_ITEM.
* Add virtual method to EDA_ITEM object to test if item supports replacing
  text.
* Replace switch statement magic numbers in Eeschema socket connection code
  with Pcbnew for improved readability.

PCB_ITEM: GetPosition -- removed reference
load/save length in config

Some code restyling: VECTOR_PCB is an array. Cleanup uncontrolled definitions of abs, max, etc. max is now overloaded function and MAX is a macro.

Nanometric work. Design rules, D_PAD (except m_Pos) is now in new units. Metric files can be loaded w/o KICAD_NANOMETRE flag set but saved only with this flag, this could help to gain some compatibility during transition process. ifdef'd code is somewhat minimized by using transition macros. Some potential code bugs are commented.