This should help make OpenSSL configuration on Windows servers easier by allowing the openssl.cnf file to be set directly in the ownCloud config, rather than in SetEnv commands that don't exist and are hard to replicate in IIS.

Remove gravatar and no-avatar functionality, prepare for default avatars even more and reword some stuff

default session_lifetime is 24hrs
recreation of session is triggered at 50% of the session life time

clarify documentation. Fixes https://github.com/owncloud/core/issues/2624 

see #2568

Required by several applications like our pdf viewer

Add support for a reverse proxy that only forwards SSL connections
unencrypted to the web server.

This patch allows to detect the reverse proxy via regular expression for
the remote IP address and conditional overwrite the host name, protocol
and web root.

Add support for a reverse proxy that handles multiple domains via different
web roots (http[s]://proxy.tld/domain.tld/owncloud).

As the reverse proxy web root is transparent for the web server the
REQUEST_URI and SCRIPT_NAME need manual adjustments. This patch replace
the direct use of this _SERVER variables with function calls and extend
this functions to overwrite the web root. Additionally it adds a Sabre
request backend that extends the Sabre_HTTP_Request to use the same
functions.

added parameter mail_smtpauthtype to set SMTP authentication type. 

The debug mode should not be enabled in productive environments and is also a security risk since some apps outputs unsanitized debug data to the template.