Split database::Map put/del from insert.rs and remove.rs

Signed-off-by: Jason Volk <jason@zemos.net>

src/database/map.rs

@@ -2,6 +2,7 @@ mod clear;
 pub mod compact;
 mod contains;
 mod count;
+mod del;
 mod get;
 mod get_batch;
 mod insert;
@@ -10,6 +11,7 @@ mod keys_from;
 mod keys_prefix;
 mod open;
 mod options;
+mod put;
 mod qry;
 mod qry_batch;
 mod remove;