Improve Makefile build detection

* bwbasic and renum were broken into their own steps.
 * Dependencies were setup
 * "all" target was made to build both and is the default target

Makefile

@@ -21,14 +21,20 @@ LIB=-lm
 DEST=/usr/bin
 # HOME=$HOME
 
-bwbasic:
+.PHONY: all
+all: bwbasic renum
+	ls -l bwbasic renum
+
+bwbasic: bw*.c bw*.h
 	$(CC) $(CFLAGS) -o bwbasic bw*.c $(LIB) -DLINUX
+
+renum: renum.c
 	$(CC) $(CFLAGS) -o renum renum.c $(LIB) 
-	ls -l bwbasic renum
+	
 
 # bwbasic and renum runtime. editfl temp file created by renum
 clean:
-	rm *.o bwbasic renum editfl core || true
+	rm *.o bwbasic renum editfl editfl.bas core || true
 
 install:
 	ls -l bwbasic renum