Cleaned up src/lib/utils library. Renamed server_ functions to more logical

names. All system processes can now either use panic() or report() from
libutils, or redefine their own function. Assertions are done via the standard
<assert.h> functionality.

lib/utils/env_panic.c

@@ -14,6 +14,6 @@ char *key;		/* environment variable whose value is bogus */
   	printf("WARNING: sys_getkenv() failed in env_panic(): %d\n", s);
   }
   printf("Bad environment setting: '%s = %s'\n", key, value);
-  server_panic("","", NO_NUM);
+  panic("","", NO_NUM);
 }