Fixes https://github.com/owncloud/core/issues/13657

Ref https://github.com/owncloud/core/issues/13693#issuecomment-71546767

Currently if a user does not replace the .htaccess file with the new update this can lead to serious problems in case Apache is used as webserver.

This commit adds the version to the .htaccess file and the update routine fails in case not the newest version is specified in there. This obviously means that every release has to update the version specified in .htaccess as well. But I see no better solution for it.

Conflicts:
	lib/private/updater.php

Depending on the used environment the port might be appended to the host header resulting in an inaccessible instance when initially setting up on a system with a different HTTP or HTTPS port. (for example test:500)

To test this setup ownCloud under a different port with and without this patch. (heads-up: localhost is always white-listed, so use a different domain)

Since automatic schema migrations are not yet possible let's disable this for now.

...

This commit will make the supported DBs for installation configurable within config.php. By default the following databases are tested: "sqlite", "mysql", "pgsql". The reason behind this is that there might be instances where we want to prevent SQLite to be used by mistake.

To test this play around with the new configuration parameter "supportedDatabases".

Correctly use overwritemailurl value when generating absolute urls in CLI

Fix #11500

Rename the config to *cli

Add overwrite.cli.url to the sample config

Revert separator fix, fixes unit test

Fix #10514

This adds some security utilities to core including:
- A library for basic crypto operations (e.g. to encrypt passwords)
- A better library for cryptographic actions which allows you to specify the charset
- A library for secure string comparisions

Remove .htaccess

Remove .htaccess

Fix typo

Add public API

Use timing constant comparision

Remove CBC constant

Adjust code

Remove confusing $this

* test case added to avoid adding them later

In environments where the data folder is mount from another partition,
it is important to check that the data folder we see is actually the
real one. If the mount failed for some reasons, this fix will make
ownCloud temporarily unavailable instead of causing unpredictable
behavior.

1. We're maintaining the same code twice which leads inevitably to problems as this one. The createHtaccess routine is only used to use the correct paths to the 404 and 403 document.
2. Updating the ownCloud instance as described in our documentation (`Delete everything from your ownCloud installation directory, except data and config.`) will break the links to the ErrorDocuments anyways and show the default error handlers if ownCloud is not installed in the root directory.

269f24cf was not changed in setup.php which prevented loading of CSS files in some environments (e.g. my local setup) for apps.

Conflicts:
	lib/private/vcategories.php

 - Use camelCase

 - Add some phpdoc

 - Fix some indents

 - Use some more spacing