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

lib/libsys/srv_kill.c

@@ -8,7 +8,7 @@ srv_kill(pid_t pid, int sig)
 	message m;
 
 	memset(&m, 0, sizeof(m));
-	m.m1_i1 = pid;
-	m.m1_i2 = sig;
-	return _taskcall(PM_PROC_NR, SRV_KILL, &m);
+	m.PM_SIG_PID = pid;
+	m.PM_SIG_NR = sig;
+	return _taskcall(PM_PROC_NR, PM_SRV_KILL, &m);
 }