Several bug corrections
1. CollectHDRStrategy.parseFilelist bug correction:
CompositeImageCollector was added to the result list instead of the
CompositeImage
2. CollectHDRStategy.parseDir: glob.glob parameter fixed.
Parsing for HDR sequences added to DirectoryExpander.
Click handling of tree items moved to Expander objects. The path for HDR
object is not in the hdr_config_dict. It can not be as the output path
can be outside the tree structure of single images.