* Change: read new version number from file in case of an update
* Fix: put the version checks into a block, that will only be executed in absence of an error
* Fix: stop update even with equal version numbers of current installation and update version
* Fix: compare the current version with the array of allowed version numbers, not with version number of the update
* Change: replace $update['version'] with $newVersion
It's not part of the given data and will be read from the file VERSION.
Thatswhy it is now a separated variable.
* Change: use the file VERSION to get the version number
* Fix: relative path must be given from the requested script, not the included one
