tabs -> spaces [#2134]
create() returns a reference to a pagezone instead of a copy [#2134]
return parent section too from getAllSections() [#2134]
getPageZone() returns reference to page zone instead of copy [#2134]
- refactoring
- print debug info to temp file which cannot be printed to screen in new PHPunit versions [#2134]
added a function rereadExtras() to, yes, reread extras when the extra array has been corrupted by some function, such as insertExtraAfter()
 insertExtraAfter() should invalidate the extra array so that it is automatically reread, but somehow it doesn't always [#2134]
building the inheritance structure now works [#2134]