return false in getUserData in case of errors

The interface contract for the method getUserData does not allow an empty array to be returned.

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correctly escape comments in user names. fixes #4099

do not pass referrer on api retry. fixes #3824

Our cache system ignores purge requests that have a referrer. The idea
is to avoid permanent recaching because a purge link was posted
somewhere.
Howev

do not pass referrer on api retry. fixes #3824

Our cache system ignores purge requests that have a referrer. The idea
is to avoid permanent recaching because a purge link was posted
somewhere.
However for the retry link in the extension manager we actually want the
link to work. So this patch supresses the referrer for that link.

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More resilence when talking to plugin repo fixes #4135

When the plugin repository answers but returns non-data (as can happen
when the database isn't available, as we have learned yesterday), the
ex

More resilence when talking to plugin repo fixes #4135

When the plugin repository answers but returns non-data (as can happen
when the database isn't available, as we have learned yesterday), the
extension manager still tried to deserialize the data.

This changes all communication from php-serialized to JSON encoded data.
When JSON-decoding fails, the data is ignored and an error message is
shown. Failure data like this will not be cached.

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API: code style fixes

wild stab at fixing a failing test

RemoteApiTest::testCreateUserFailAccess failed on github but worked for
me. Seems to be a caching problem in auth_ismanager()

API: move user related tests to usermanager plugin

API: move create/delete user calls to usermanager

This only moves the calls. A proper refactoring of the user manager
would make sense:

1) introduce a helper component covering the basic operations

API: move create/delete user calls to usermanager

This only moves the calls. A proper refactoring of the user manager
would make sense:

1) introduce a helper component covering the basic operations including
proper error signalling using Exceptions
2) refactor admin and cli components to make use of 1)
3) make the operations in 1) available via the API

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Adjust ACL remote component to new system

There is no need to implement getMethods anymore. All data comes from
reflection

another set of api tests

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automatically prune old logs

This adds a new configuration that allows to define how many logfiles
per facility should be kept. Old files are pruned daily via the task
runner.

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�� Rector and PHPCS fixes

avoid another warning in authad