Fixed bugs
Bug in read version.txt
To define the default state, a session variable is used. When setting session variables, the getHelpdezkVersion() method is used.
File version.txt had a blank line and this was not being tested by the code, so it returned $ this_version = "".
This error caused the getConfigSession() method to not work correctly, as the version number was undefined.
Replaces fopen with file_get_contents and added several tests to mitigate the problem.