AdPlay/DOS 1.6 released

Here comes a (very) late release of AdPlay/DOS version 1.6! It has been delayed for over 6 months due to hardware resource constraints and still might not be thoroughly tested. Please report any found bugs!

From the NEWS:
- Support for the DJGPP compiler.
- Binary version compiled with DJGPP.
- Updated to be fully compatible with the ISO standard C++ library.