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

etc/system.conf

@@ -57,7 +57,6 @@ service pm
 	vm			# Extra VM calls allowed:
 		EXIT		# 00
 		FORK		# 01
-		BRK		# 02
 		EXEC_NEWMEM	# 03
 		WILLEXIT	# 05
 		NOTIFY_SIG	# 39