* support/include/buffer_test_io.h: Add support for using printk for
output in tests. This should be followed up by disabling the console
driver and other support when the tests are using printk.
* Per PR47 add support for buffered test output. This involved
adding defines to redirect output to a buffer and dump it when
full, at "test pause", and at exit. To avoid problems when redefining
exit(), all tests were modified to call rtems_test_exit().
Some tests, notable psxtests, had to be modified to include
the standard test macro .h file (pmacros.h or tmacros.h) to
enable this support.
* include/buffer_test_io.h: New file.
