input.Makefile: Staging tables: import/install-%: Only install staging table if input contains only CSV sources. Changed $(isXml) to $(isCsv) (negated) everywhere because rules almost always only run something if input contains only CSV sources, rather than if input contains XML sources.
input.Makefile: Staging tables: import/install-%: Only install staging table if input contains only CSV sources. Changed $(isXml) to $(isCsv) (negated) everywhere because rules almost always only run something if input contains only CSV sources, rather than if input contains XML sources.