doc update
use wait and retransmit when receiving session tickets
doc update
doc update
rnd: if RUSAGE_THREAD fails try RUSAGE_SELF
doc update
placed all rusage variables into HAVE_GETRUSAGE block
updated to libopts 5.18.4
doc update
bumped version
simplified getrusage code; the failure check code wasn't needed
corrected the SSSE3 optimized SHA224
corrected libopt's Makefile.am

reported by Marius Schamschula.
guile: Remove trailing zero in 'gnutls_server_name_set' call.

In GnuTLS 3.2.19 (and possibly 3.3.9 and 3.1.17),
'set-session-server-name!' would pass a trailing nul character on the
wire after the server name, which would thus be rejected by servers.