cache total  user count
Backport \OC\Security\Crypto to ownCloud 7

Conflicts:
	lib/repair/repairconfig.php
Only store user credentials when SMB_OC storage is enabled
Don't show favicon to prevent iteration through subfolders

The codepath for generating the favicons iterates through subnodes and if one of those nodes is unavailable is throwing a 503 exception. Since these favicons don't have any use except of "making a tool for developers looking nicer" I consider it feasible to remove them.
added comment that App Store is disabled for EE
delete old previews
Add notes that SQLite is CE only
Markup corrections
add ldap-search command to occ
LDAP search filter creation changes:

1. do not prepend * wildcard to search terms. Will result in faster search, but
you don't find "foobar"  when looking for "bar"
2. advanced behaviour when search string contains a space and multiple search
attributes are present. The search string is split into single words. The
resulting filter requires that each word at least appears once in any search
attribute. This is supposed to return better results in big LDAPs.
Check for XMLWriter class

Backport of https://github.com/owncloud/core/pull/12321
Disable MSSQL for new CE installations

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

Conflicts:
	lib/private/setup.php
Adjust sample config
Merge pull request #12496 from owncloud/check-xml-writer-for-7

Check for XMLWriter class
Merge pull request #11747 from owncloud/storeCredentialsOnlyInSessionIfRequired

Store credentials only in session if required
Merge branch 'stable7' of https://github.com/owncloud/core into stable7
Allow read-only configuration

Workaround required for IIS setups running ownCloud to prevent dataloss.

Long-term solution would be to move some configuration settings to the database

Conflicts:
	lib/base.php
	settings/admin.php
7.0.4 RC1
Merge branch 'stable7' of https://github.com/owncloud/core into stable7
add proper description what database is supported by CE and EE