Pcbnew NETLIST_READER improvements.

* Create separate NETLIST object to hold contents of netlist files.
* Read entire netlist and footprint link files before making applying
  changes to board.
* Add BOARD::ReplaceNetlist() function to eliminate the calls between the
  NETLIST_READER, PCB_EDIT_FRAME, and BOARD objects.
* Change placement of new components below the center of the current board
  or in the center of the page if the BOARD is empty.
* Add dry run option to netlist dialog to print changes to message control
  without making changes.
* Add button to netlist dialog to allow saving contents of message control
  to a file.
* Eliminate the need to compile netlist_reader_*.cpp in both CvPcb and Pcbnew.
* Add netlist_reader_*.cpp to the pcbcommon library.
* Remove redundant load component link file code from CvPcb.
* Modify CvPcb new to work with the new NETLIST_READER object.
* Add compare() function and < and == operators to FPID object.
* Add REPORTER class to hide an underlying string writing implementation for
  use in low level objects.  Thank you Dick for the idea.
* Lots of minor coding policy, Doxygen comment, and missing license fixes.

eeschema/class_library.cpp

@@ -148,7 +148,7 @@ void CMP_LIBRARY::GetEntryNames( wxArrayString& aNames, bool aSort, bool aMakeUp
  * simple function used as comparator to sort a std::vector<wxArrayString>&.
  *
  * @param aItem1 is the first comparison parameter.
- * @param aItem1 is the second.
+ * @param aItem2 is the second.
  * @return bool - which item should be put first in the sorted list.
  */
 bool sortFunction( wxArrayString aItem1, wxArrayString aItem2 )