IntrospectionHelper shouldn't cause __autoload() to be called

[knut]

The IntrospectionHelper is checking return values in phpdoc comments for possible class names and does a check with class_exists(). This will cause __autoload() to be called if defined. Since this code has no reason to call __autoload() it shouldn't since it would most likely break. Typically @return void etc.

The fix is to set the second parameter to class_exists to false to ensure that __autoload() is never called.

This issue was discovered running code coverage of PRADO trunk.

[knut]

Commited fix to branches/2.2.