OC6: Implement Doctrine as the backend for OC_DB

fixing UNIX_TIMESTAMP() for mssql

WebDAV Auth Connector: Check if already logged in

<<<EOL seems not to use proper end of lines on windows

Seperate the memory based cache and file based cache in OC_Cache

Fix renaming using parenthesis

Markdown readme master

Fix some typos

Move error handlers from OC_Log to OC\Log\ErrorHandler

Basic Auth is broken - again...

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Conflicts:
	3rdparty
	lib/db.php
	lib/setup.php
	tests/lib/db.php
	tests/lib/dbschema.php