Bugfix: irrArray should no longer crash when using other allocators. Corresponding test added. This was 
caused because operator= and copy-constructor where not called because the the second template parameters 
was not used in those function declarations and so only functions for the default parameter had been 
created. 


git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2949 dfc29bdd-3216-0410-991c-e03cc46cb475