rename unApply to unApp in the Java binding to be consistent with Haskell & Python

src/runtime/java/jpgf.c

@@ -1371,7 +1371,7 @@ Java_org_grammaticalframework_pgf_Expr_initApp__Ljava_lang_String_2_3Lorg_gramma
 }
 
 JNIEXPORT jobject JNICALL
-Java_org_grammaticalframework_pgf_Expr_unApply(JNIEnv* env, jobject self)
+Java_org_grammaticalframework_pgf_Expr_unApp(JNIEnv* env, jobject self)
 {
 	jclass expr_class = (*env)->FindClass(env, "org/grammaticalframework/pgf/Expr");
 	if (!expr_class)

src/runtime/java/org/grammaticalframework/pgf/Expr.java

@@ -87,7 +87,7 @@ public class Expr implements Serializable {
 		 * a function application, then it is decomposed into 
 		 * a function name and a list of arguments. If this is not 
 		 * an application then the result is null. */
-		public native ExprApplication unApply();
+		public native ExprApplication unApp();
 
 		/** If the method is called on an expression which is 
 		 * a meta variable, then it will return the variable's id.