Edit SAIL files to be like the originals from ITS.

Rename according to SAIL file C.LIB[C,SYS].  Fix E stuff and remove
trailing ^C and ^@s.

src/c/expr2.grammr

@@ -0,0 +1,17 @@
+'+' '-' '*' '/' '(' ')' int
+
+\< '+' '-'
+\< '*' '/'
+
+\\
+
+s:		  e		{printf (1, "%d\n",#1);}
+e:		  e '+' e	{val = #1 + #3;}
+		| e '-' e	{val = #1 - #3;}
+		| e '*' e	{val = #1 * #3;}
+		| e '/' e	{val = #1 / #3;}
+		| p
+
+p:		  '-' p		{val = - #2;}
+		| '(' e ')'	{val = #2;}
+		| int