cleaned up pthread attributes [Brian Johnson]
- documentation updates - 2001 -> 2002 - version 0.9 -> 1.0
small fixes
- supported audio formats are now kept in STL vectors - added run-time audio parameter switching for OSS/ESD audio output - setting ESPEAKER env variable causes B2 to try ESD before OSS
- bumped version number to 0.9 - updated copyright dates
- added audio support for IRIX [Brian J. Johnson] - improved Delay_usec() under FreeBSD and IRIX - fixed typo ("HAVE_PTHREDS") in video_x.cpp
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