first check if current dir is a structure, before trying subdirs
first check if current dir is a structure, before trying subdirs

getStructures() used to work on the assumption that of the given 
structuresPath, only subdirs needed to be verified as structures/nodes.
This is now changed in that it first verifies whether the given 
structuresPath is also a structure.

SpectrumBroad/xible,SpectrumBroad/xible