typo Collexp -> CollExp in OCL/Manifest.xmf (to compile on Linux)
use normalizeFilename() instead of toLower() on filenames handled by
editors (to make file editing work on Linux); normalizeFile() added to
String as null-implementation for now
Merge branch 'master' of https://github.com/xmf-xmodeler/XMF.git
reverted unsuccessful attempt to correct OCL/Collexp.o to OCL/CollExp.o,
instead renamed source file OCL/CollExp.xmf to OCL/Collexp.xmf to make
compilable on Linux