Purpose of commit: document bug fix
Commit summary:
---------------
Vorlon committed this one, so he should get the credit.
0.73: please submit patches for this section with actual code/doc
patches!
+* fix for pam_unix (support.c) to avoid segfault with NULL password
+ (Bug 113238 - vorlon)
* fix to pam_unix_passwd: try repeatedly to get a lock on the password
file, instead of failing immediately (Bug 108845 - fix vorlon)
* fix to pam_shells: logged information was not formatted correctly