Clean up interface to PM and VFS

- introduce new call numbers, names, and field aliases;
- initialize request messages to zero for all ABI calls;
- format callnr.h in the same way as com.h;
- redo call tables in both servers;
- remove param.h namespace pollution in the servers;
- make brk(2) go to VM directly, rather than through PM;
- remove obsolete BRK, UTIME, and WAIT calls;
- clean up path copying routine in VFS;
- move remaining system calls from libminlib to libc;
- correct some errno-related mistakes in libc routines.

Change-Id: I2d8ec5d061cd7e0b30c51ffd77aa72ebf84e2565

commands/readclock/readclock.c

@@ -4,6 +4,7 @@
 #include <lib.h>
 #include <sys/types.h>
 #include <stdlib.h>
+#include <string.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <time.h>
@@ -146,6 +147,7 @@ readclock(int type, struct tm *t, int flags)
 		exit(1);
 	}
 
+	memset(&m, 0, sizeof(m));
 	m.RTCDEV_TM = (char *) t;
 	m.RTCDEV_FLAGS = flags;