docx pptx etc can now be loaded
Merge branch 'developer' of https://github.com/nomacs/nomacs into developer

Conflicts:
	ImageLounge/src/DkImage.cpp
	ImageLounge/src/DkImageContainer.cpp
	ImageLounge/src/DkImageContainer.h
	ImageLounge/src/DkThumbs.cpp
loading zip files fixed (END - from thumbs)
fixes for browsing zips etc
build fixes cleaning