[crossfire] automated unit testing

[tchize]

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The first shoot of unit test has been commited in cvs, along with a
few very nice add-ons to configure script. The framework has been
configured for test/unit/**

other directories will be linked later, there is already plenty of
file to work on :)
to run unit tests, do a
./configure
make
make -k check

the -k is important, it tells make to continue even if some tests fails.
I have made empty testcase failing for all existing crossfire files.
We now need lots of apes / monkeys, to write the test code to have
them success. An example finished file is test/common/check_shstr.c

all test logs go to test/logs as xml files (will be usefull for
automated webpage generation with nightliy test result on sourceforge :p)

screen ouput of test are driven by environment variable
CK_VERBOSITY
 which can have the values "silent", "minimal", "normal, "verbose"

first doc written in doc/Developers/testplans (this was the previous
test docs, it as been replaced)

Have fun, code well, let's get all those test filled :)

Tchize
David Delbecq
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