Fixed various CMS_MODULE.install, by not marked module installed if an error occurred!

Improved Auth related module implementation by having a way to change settings like token, max age.
  - use CMS_SETUP.site_id and related "auth.$module.token" ... configuration values.
  - removed related CMS_..._CONSTANTS classes.

For auth session module, use auth_session as table name, and use VARCHAR(64).
Extracted sql from blog module, and store it under site/scripts/install.sql .
Renamed a few $modulename.sql as install.sql

examples/demo/site/config/cms.ini

@@ -4,9 +4,13 @@ root-dir=site/www
 #modules-dir=site/modules
 
 [site]
+# General token that could be use for cookies, and related.
+id=_EIFFEL_CMS_
+
 # Name of the site, for the title, and eventual message.
 name=Eiffel CMS
 
+# Properties used for SEO.
 property[headline]=Eiffel CMS -- the demo
 property[description]=Demo for Eiffel ROC CMS.
 property[keywords]=eiffel,cms,demo
@@ -43,6 +47,14 @@ output=site\db\mailer.log
 [blocks]
 @include=blocks.ini
 
+[auth]
+# token, default is $site.id or built-in.
+#token=_ROC_AUTH_TOKEN_
+#session.token=
+#session.max_age=86400
+#openid.token=
+#oauth.token=
+
 [admin]
 # CMS Installation, are accessible by "all", "none" or uppon "permission". (default is none)
 installation_access=all