Add compatibility with TYPO3 8.7

[christophlehmann]

Closes #7

I checked functionality in 7.6 and 8.7 successfully.

[christophlehmann]

Searching for users does not work. Seems we need to work with constraints in https://github.com/dkd/tc_beuser/pull/8/files#diff-cf9c68596fb59fdebda2347f76b73d11R333

The SQL error is

An exception occurred while executing 'SELECT COUNT(*) FROM be_users WHERE (be_users.pid = 0) AND ((LOWER(username) LIKE LOWER('%madi%')) OR (LOWER(email) LIKE LOWER('%madi%')) OR (LOWER(realName) LIKE LOWER('%madi%'))) AND (be_users.pid= 0 ANDbe_users.deleted = 0 (LOWER(username) LIKE LOWER('%madi%')) OR (LOWER(email) LIKE LOWER('%madi%')) OR (LOWER(realName) LIKE LOWER('%madi%'))) AND (be_users.deleted = 0)': SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '(LOWER(username) LIKE LOWER('%madi%')) OR (LOWER(email) LIKE LOWER('%madi%')' at line 1

The wrong piece is the double ((

[IchHabRecht]

Hi @christophlehmann,

The problem is no double bracket, but a missing " AND " between "AND be_users.deleted = 0" and "(LOWER(username) LIKE LOWER('%madi%'))" (3rd-4th line in your error message). Unfortunately (luckily to you) this seems to be a core bug and is not related to the extension nor to your changes.

[IchHabRecht]

You can verify the core patch at https://review.typo3.org/55840