Catch more fork() errors.
Moved sleep_until_file_created() here from "mysql-test-run.pl".
Improved debug output.
mtr_io.pl:
Improved mtr_get_opts_from_file(), try to mimic some sh.
mysql-test-run.pl:
Cleaned up the timeout handling.
Created new function environment_setup().
Corrected time zone handling.
Moved sleep_until_file_created() to "lib/mtr_process.pl".
Improved debug output.
Added missing stop_reap_all() if returns early from function
mysql-test-run.pl:
Improved output from --script-debug
Initial Cygwin support
Improved mysqld process termination
