Correct some spelling mistakes

Automaticaly --> Automatically Invalide --> Invalid Strech --> Stretch allows to --> allows one to attachement --> attachment contraints --> constraints inconsistant --> inconsistent occured --> occurred occurences --> occurrences permits to --> permits one to postion --> position regularily --> regularly transfered --> transferred

I've tried to touch the inline help text as little as possible but had to reword a few things to make the text fit in the line length limit. The result should be clearer english in any case, hopefully!