.gitignore: ignore emacs tempfiles
auth-umich.c: Update default values for configuration files

* Switch the authorize file to /etc/pam_pts.confdir
* Point the afs initialization directory to be AFS default location
auth-umich.c: pr_Initialize is from afs/ptuser.h
pts_acct_mgmt.c: Allow reference of allow_service_request()

pts_acct_mgmt.c references allow_service_request() from auth-umich.c,
but the compiler doesn't know how to reference it.  Add a .h file and
include it in the .c file.
pts_acct_mgmt.c: read() and close() are defined in unistd.h