because OC_User::login will create a new session we shall only try to login if user and pass are set

ensure to never destroy an existing session

Some PHPDocs were incorrect, also used this opportunity to replace some deprecated functions.

This is unused legacy code. Let it die with ~~~honor~~ fire.

Fixes https://github.com/owncloud/core/issues/12346

fix calculation of expiration date if there is a default expiration date set (but not forced) and the user does not want the link to expire.

This reverts commit 09fd34ee.

This is not installed by default in all cases and will break the DAV features of ownCloud. Lot's of reports such as https://github.com/owncloud/ios-issues/issues/167#issuecomment-63798507

add postfix

Warning: -convert-to is deprecated.  Use --convert-to instead.
Warning: -outdir is deprecated.  Use --outdir instead.

Remove all ports from the trusted domains

Conflicts:
	lib/private/repair.php
	lib/repair/repairconfig.php

This lead to a lot of confusion in the past and did not really offer any value. Let's remove the port check therefore. (it's anyways not really a part of the domain)

Fixes https://github.com/owncloud/core/issues/12150 and https://github.com/owncloud/core/issues/12123 and also a problem reported by @DeepDiver1975.

Conflicts:
	lib/private/request.php

make sure that we only find the shares from the correct share type if users and groups with the same ID exists

In some cases the 'size' field is not available resulting in some PHP errors such as:

```json
{"reqId":"03548fd9e3d3aca15a5796b3b35d7b9d","remoteAddr":"::1","app":"PHP","message":"Undefined index: size at \/Users\/lreschke\/Programming\/core\/lib\/private\/files\/fileinfo.php#125","level":3,"time":"2014-11-17T21:38:57+00:00"}
```

This can be experienced when creating a new empty file and deleting it right away, then when going to the trash bin this error is thrown.