Update documentation of build.properties and metacat.properties prior to the metacat 1.7.1 release.
The main goal here was to ensure that all previously undocumented properties are now present in these documents. Some minor edits were also made to a few of the already documented properties.
A fairly lengthy description was written for the 'indexPaths' build property. Perhaps in future documentation there should be a sub-section of the "Query and Results" document that describes indexPaths at greater length.
These revisions were made by costa and tao.