Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

TARGET_EXEC allows running FATE on simulators, remote targets and
memory checkers. Also document a known issue with Wine and mixed
Unix/Windows line ending.

FATE_SAMPLES is now used directly by the Makefiles, which induces the test
system to run a test with the value of the environment variable as name.
Renaming the environment variable to LIBAV_SAMPLES avoids this problem.

Signed-off-by: Diego Elio Pettenò <flameeyes@flameeyes.eu>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

  The fate.txt file is ported to texinfo format. Therefore the
fate.txt is renamed to fate.texi. The contents of the already
existing fate.texi file are discarded.

  However there should be no loss of information. If you find
anything missing, please report.
Signed-off-by: Alexander Strasser <eclipse7@gmx.net>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Summarize the information provided in the wiki and the one provided
in fate.txt