insert_proxies: remove 500-at-a-time logic

it's now done by mysqlite.py executemany.

dbs.py

@@ -34,10 +34,8 @@ def insert_proxies(proxydb, proxies, url):
 	for p in proxies:
 		new.append((timestamp,p,3,0,0,0))
 
-	while len(new):
-		proxydb.executemany('INSERT INTO proxylist (added,proxy,failed,tested,success_count,total_duration) VALUES (?,?,?,?,?,?)', new[:500])
-		new = new[500:]
-		proxydb.commit()
+	proxydb.executemany('INSERT INTO proxylist (added,proxy,failed,tested,success_count,total_duration) VALUES (?,?,?,?,?,?)', new)
+	proxydb.commit()
 
 	_log('+%d item(s) from %s' % (len(proxies), url), 'added')