uCON64 Code (SVN)

- Fixed warnings when compiling with Clang 8.0.1.

- Fixed code that displays the I/O port of the Extended Control register.

- Restored support for NetBSD/i386 and OpenBSD/i386 in makefile of libcd64.

- Mentioned Kristian's full name.
- Removed conditional statement that was never executed, because i equals 0.

- Simplified GD transfer (uploading) code somewhat, now that some parts are
clearer to me. Removed some redundant code.
- Updated year.
- Removed stray /DHAVE_CONFIG_H from src/backup/libcd64/Makefile.
- Corrected claim in changes.html. TSF3.EXE had the cartridge (memory unit)
dumping functionality sometime around 1993. However, around 2005 it had
become a problem that the GDSF6 protocol requires a parallel port of which
the control register can be read, because few built-in parallel ports still
supported that. So, until recently no tool was available that offers dumping
functionality, at least on modern hardware.

- Implemented dumping for --xgd6. 15 years late, but still the first tool to do
it :-)

- Added missing dependencies.

- Added proper support for Clang to the makefiles. Indicate that you want to
use Clang by setting the environment variable CC. Either at configuration time:
$ CC=clang ./configure
or at build time:
$ CC=clang make

- Scratched a few itches.

- Increased the version to 2.2.2 (WIP).