0005995: search with spaces only causes MySQL exception (cherry picked from commit c551f5f)
0005893: copy/paste error in source code documentation ( class thankyou.php )
0006003: Method will be invoked on argument with default value `null' (cherry picked from commit 4c2f30b)
0005903: currency sign in front of amount still wrong
adopting code to fit all editions
temporary commented as skipped trusted shops decline our connection.

Might be temporary problem as we perform too many request to trusted Shop
Merged branch updates from b-5.2-ce
Reapplied changes to memory limit checking method oxSysRequirements::checkMemoryLimit() after merging updates from upstream
use dataProvider for memory limit definitions in unit test