Bumped next release version to become 7.23.0 for the changes

A custom HTTP header ending in a semicolon instead of a colon
will be treated as a header to be added without any data
portion.

Five more bugfixes, one more contributor

Feature string literal NTLM_SSO renamed to NTLM_WB.
Preprocessor symbol USE_NTLM_SSO renamed to WINBIND_NTLM_AUTH_ENABLED.
curl's 'long' option 'ntlm-sso' renamed to 'ntlm-wb'.
Fix some comments to make clear that this is actually a NTLM delegation.

Bug: https://bugzilla.redhat.com/728562

Three more bugs fixed, three more contributors mentioned

Mention 5 bugixes and 1 change more

Curl_gss_init_sec_context got new parameter - SessionHandle.

Signed-off-by: Adam Tkac <atkac@redhat.com>

libcurl inappropriate GSSAPI delegation. Full details at
http://curl.haxx.se/docs/adv_20110623.html

When closing a connection, the speedchecker's timestamp is now deleted
so that it cannot accidentally be used by a fresh connection on the same
handle when examining the transfer speed.

Bug: https://bugzilla.redhat.com/679709

In case a client certificate is used, invalidate SSL session cache
at the end of a session.  This forces NSS to ask for a new client
certificate when connecting second time to the same host.

Bug: https://bugzilla.redhat.com/689031