void toggletag(const char *arg); /* toggles sel tags with arg's index */
void toggleview(const char *arg); /* toggles the tag with arg's index (in)visible */
void view(const char *arg); /* views the tag with arg's index */
+void shiftview(const char *arg); /* views next(1)/previous(-1) tag */
/* util.c */
void *emallocz(unsigned int size); /* allocates zero-initialized memory, exits on error */