Added 'D' (Date) support
Disallow field lengths > 255
Removed realloc() calls for pszFieldBuffer memory to fix error in vc7.1 compilation
Changed definition of null-valued text field from 0x00 to 0x32 (space chars)
Use isspace() instead of ==' ' to test for leading and trailing whitespace in non-numeric fields
Fixed bug in DBFCloneEmpty