Examples: * rename the on-calc variables so as to avoid name clashes. It's now possible to transfer e.g. Hello World 1 and Hello World 2 at the same time, without either overwriting the other one. * Bitmap Test.c: add a newline at EOF, so that GCC is happy; * Custom DLL Test.c: don't define SAVE_SCREEN, the TPR already takes care of that, and GCC warns about the redefinition.