lib/srdb1: added the ability to use bitwise-and in DB queries

- This is used in the changes to add db only mode to pua
- This enhancement was made by Paul Pankhurst at Crocodile RCS

lib/srdb1/db_op.h

@@ -42,6 +42,8 @@
 #define OP_GEQ ">="
 /** operator negation */
 #define OP_NEQ "!="
+/** bitise AND */
+#define OP_BITWISE_AND "&"
 
 
 /**