several bugfixes, including some memory management

nethogs.h

@@ -19,6 +19,10 @@
  * after which a process is removed */
 #define PROCESSTIMEOUT 150
 
+/* the amount of time after the last packet was recieved
+ * after which a connection is removed */
+#define CONNTIMEOUT 50
+
 /* Set to '0' when compiling for a system that uses Linux Capabilities,
  * like www.adamantix.org: in that case nethogs shouldn't check if it's
  * running as root. Take care to give it sufficient privileges though. */