Revert "FEM: Updated fix to constraint displacement reference deletion, update hide show, remove custom input writer, update vertice, edge, face selection."

This reverts commit ac4d466443.

src/Base/QuantityLexer.c

@@ -109,10 +109,7 @@ typedef unsigned int flex_uint32_t;
 #endif
 
 /* Returned upon end-of-file. */
-# ifdef YY_NULL
-#  undef YY_NULL
-#  define YY_NULL 0
-# endif
+#define YY_NULL 0
 
 /* Promotes a possibly negative, possibly signed char to an unsigned
  * integer for use as an array index.  If the signed char is negative,
@@ -689,7 +686,7 @@ static int input (void );
 	if ( YY_CURRENT_BUFFER_LVALUE->yy_is_interactive ) \
 		{ \
 		int c = '*'; \
-		unsigned int n; \
+		int n; \
 		for ( n = 0; n < max_size && \
 			     (c = getc( yyin )) != EOF && c != '\n'; ++n ) \
 			buf[n] = (char) c; \