several larger changes came together, bit of cleaning too

- all code must be in functions (which must be in classes).
— changes a fair few tests
— also changes api, as method is not recursive, not passed around
- all state in instance vars in compiler (no accessors)
- class is another such variable, surely more coming
all green again

lib/virtual/machine.rb

@@ -132,11 +132,11 @@ module Virtual
       self
     end
 
-    def compile_main bytes
+    def parse_and_compile bytes
       syntax  = @parser.parse_with_debug(bytes)
       parts = Parser::Transform.new.apply(syntax)
       #puts parts.inspect
-      Bosl::Compiler.compile( parts , @space.get_main )
+      Bosl::Compiler.compile( parts )
     end
 
     private