clarified "isabelle build_polyml": download and build everything for current platform;
renamed former "isabelle build_polyml" to "isabelle make_poly", for experimentation and diagnosis;
#built-in components
src/Tools/jEdit
src/Tools/GraphBrowser
src/Tools/Graphview
src/Tools/Setup
src/Tools/VSCode
src/HOL/Mutabelle
src/HOL/Library/Sum_of_Squares
src/HOL/SPARK
src/HOL/Tools
src/HOL/TPTP