Modified the syntax of writing real-valued literals with the DSL. Casts are not needed any more: f.ex. 1.0 is implicitly cast to AcReal. The syntax is now more consistent: reals must be explicitly written as a.b, where a and b are some integers. IMPORTANT: Previously the shorthands a. and .b were allowed, not anymore. Using those shorthands will result in a compilation error

acc/src/acc.l

@@ -37,8 +37,9 @@ L [a-zA-Z_]
 
 "return"    { return RETURN; }
 
-{D}+"."?{D}*[flud]? { return NUMBER; } /* Literals */
-"."{D}+[flud]?      { return NUMBER; }
+{D}+"."{D}+         { return REAL_NUMBER; } /* Literals */
+{D}+"."{D}+[fd]+    { return NUMBER; }
+{D}+[lu]*           { return NUMBER; }
 {L}({L}|{D})*       { return IDENTIFIER; }
 \"(.)*\"            { return IDENTIFIER; } /* String */