r6352: Two new composite calls:

r6352: Two new composite calls:

- qfsinfo (query file system information)
- appendacl (append an ACL to existing file's security descriptor and get new
full ACL)

The second one also includes an improvement to security descriptor handling
which allows to copy security descriptor. Written by Peter Novodvorsky
<peter.novodvorsky@ru.ibm.com>

Both functions have corresponding torture tests added. Tested under valgrind and
work against Samba 4 and Windows XP.

ToDo: document composite call creation process in prog_guide.txt