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/libexec/exec_general.c

@@ -80,12 +80,13 @@ int libexec_pm_newexec(endpoint_t proc_e, struct exec_info *e)
   int r;
   message m;
 
-  m.m_type = PM_NEWEXEC;
-  m.EXC_NM_PROC = proc_e;
-  m.EXC_NM_PTR = (char *)e;
+  memset(&m, 0, sizeof(m));
+  m.m_type = PM_EXEC_NEW;
+  m.PM_EXEC_NEW_ENDPT = proc_e;
+  m.PM_EXEC_NEW_PTR = (char *)e;
   if ((r = sendrec(PM_PROC_NR, &m)) != OK) return(r);
 
-  e->allow_setuid = !!(m.m1_i2 & EXC_NM_RF_ALLOW_SETUID);
+  e->allow_setuid = !!m.PM_EXEC_NEW_SUID;
 
   return(m.m_type);
 }