Update history of SHAPELIB copy:

* files shpopen.c,shapefil.h,dbfopen.c:
   from ogr/ogrsf_frmts/shape/
* file safileio.c
   from SHAPELIB itself (http://shapelib.maptools.org/)

Last update
* taken from GDAL 1.5.1-SVN (Sun Mar 30 11:20:43 CEST 2008)
* taken from GDAL 1.5.0-CVS (Wed Sep  5 13:48:48 CEST 2007)
* taken from GDAL 1.3.2-CVS (Sat Jun 17 22:08:04 CEST 2006)

Additional fixes:
* dbfopen.c (around line 1013)
   GDAL bug #809 (http://trac.osgeo.org/gdal/ticket/809)

* Use <grass/shapefil.h> etc rather than "shapefil.h"
   in both shpopen.c and dbfopen.c