* tests/login_tests_saml2.c:
add logout to first SAML 2.0 login regression test.
* tests/tests.h:
add macros to simplify checking of return value with check macros
(encapsulate fail_unless macro to check for NULL/non-NULL values and
good rc value (0) or expected bad value).
* nearly all C files: change includes for relative paths.
* lasso/id-wsf/id_wsf.h, lasso/id-wsf-2.0/id_wsf_2.h: add top level
public include files for ID-WSF 1.0 and ID-WSF 2.0.
* lasso/id-ff/server.*, lasso/id-ff/session.*, lasso/id-ff/identity.*:
remove most of the code related to ID-WSF and push into
lasso/id-wsf/id_ff_extensions.* and lasso/id-wsf-2.0/identity.c,
lasso/id-wsf-2.0/server.c, lasso/id-wsf-2.0/session.c.
* lasso/id-wsf-2.0/saml2_login.c,
lasso/id-wsf-2.0/saml2_login_private.h: same change but for ID-WSF
2.0 support in SAML2 SSO profile.