BTP 6.2:

- Re-implement imagebutton support.
- Implement macros and delays, as suggested by Ronald.
- Make the error message appear at the same coordinates that the btp window
  occupies, not an absolute position.
- Add support for compiling a native btp in the makefile.
- Clean up handling of a missing remote.ini.
- Is there really no way to make Fl_Multiline_Output break lines automatically?
- Implement IR-Remote multiviews.
