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

kernel/extract-mtype.sh

@@ -7,8 +7,8 @@ set -e
 	cat ../include/minix/callnr.h | \
 	tr -s ' \t' ' ' | \
 	sed 's/^# /#/' | \
-	egrep '^#define [A-Z_][A-Z0-9_]* [0-9]+' | grep -v NCALLS 
-	
+	egrep '^#define [A-Z_][A-Z0-9_]* \((PM|VFS)_BASE \+ *[0-9]+\)'
+
 	cat ../include/minix/com.h | \
 	tr -s ' \t' ' ' | \
 	sed 's/^# /#/' | \