Some improvements with dbg levels

FossilOrigin-Name: 4f1f8f238cb3fd097504bfba3b51805d359135256160fe8fdba34908495ec50b

src/cw/cw_dbg_set_level_from_str.c

@@ -0,0 +1,30 @@
+
+#include "dbg.h"
+
+int cw_dbg_set_level_from_str(const char *level)
+{
+	int blevel,on;
+	const char *slevel;
+	
+	switch(*level){
+		case '-':
+		case '!':
+			on =0;
+			slevel=level+1;
+			break;
+		case '+':
+			slevel=level+1;
+			on=1;
+			break;
+		default:
+			slevel=level;
+			on=1;
+	}
+
+	blevel = cw_strlist_get_id(cw_dbg_strings, slevel);
+	if (blevel==-1)
+		return 0;
+		
+	cw_dbg_set_level(blevel,on);
+	return 1;
+}