split python tool, comments

simplified process_runner
renamed git_tool to git_wrap, it's just too confusing to have git that's a tool and a git_tool that's not a tool

src/tasks/python.cpp

@@ -83,7 +83,7 @@ void python::do_clean(clean c)
 		{
 			if (is_set(c, clean::reclone))
 			{
-				git_tool::delete_directory(cx(), source_path());
+				git_wrap::delete_directory(cx(), source_path());
 				return;
 			}