The latter function is considered insecure and deprecated on some platforms.
This will create the directory with 0700 implicitely, where it was 0755
beforehand. Since this is a more secure default and the test suite runs fine,
we don't bother to chmod the directory.
Currently, if a user has no associated tokens, we still prompt for an
OTP challenge and attempt to verify it.
This adds a check earlier to avoid the useless prompt in that case.
The `nullok` option is also added. It changes the return value from
PAM_USER_UNKNOWN to PAM_IGNORE. (fixes#97)
Finally, some constants have been turned to symbolic form for clarity
and debugging output is improved.
add a debug_file option for where to write debug info (default to stdout)
stop compiling with DEBUG_PAM and PAM_DEBUG
make debugging behave the same way on linux-pam and openpam
