The 'XTerm', 'XCalc', etc., files are base application resources shared by
_all_ themes. The 'XTerm-color", "XCalc-color", etc., files are default
theme-specific resources used to set up the actual theme-specific app
resource files "XTerm-color-themeName", "XCalc-color-themeName" and so
forth.

Any changes made to the base files (those without the themeName suffix ) will
affect all themes.

Any changes made to the base-color files will affect all _new_ themes
installed.

Any changes made to the base-color-themeName file affect only that
particular application running under the named theme.
