LDDTool: uses wrong version of XSD when referencing IMG dictionary

[jshughes]

LDDTool: uses the wrong version of XSD when referencing IMG dictionary. Updated config.properties file.

Resolves #229

[rchenatjpl]

@jshughes For this one, #406, #409, #416, and #421, what difference will lddtool's output have? I.e. what does it mean that lddtool added namespace "lt", "kplo", "radar", "ml", or "neas"? If the LDD input file has "xxxx" instead of one of the added ones, there's no difference except the string replacement with "xxxx".

[jshughes]

@rchenatjpl When a namespace is added, it is added to the namespace registry. See https://pds.nasa.gov/datastandards/dictionaries/index-1.17.0.0.shtml#namespaces. (See Namespaces in menu box on left side of the page.) The information added includes the namespace id, full namespace, steward id, description, etc. In addition, a subset of this information is added to the config.properties files used by LDDTool. When LDDTool runs, it validates that the namespace id listed in the Ingest_LDD file has been registered. If it has, then LDDTool is able to get additional information from the config.properties for generating the .xsd, .sch, etc files. One example of where it is used in the .xsd, is the definition of the schemas namespace.
xmlns:disp="http://pds.nasa.gov/pds4/disp/v1"