Import of heimdal-0.3f

Lots of changes, highlights include:

 * change default keytab to ANY:FILE:/etc/krb5.keytab,krb4:/etc/srvtab,
   the new keytab type that tries both of these in order (SRVTAB is
   also an alias for krb4:)

 * improve error reporting and error handling (error messages should
   be more detailed and more useful)

 * the API is closer to what MIT krb5 is using

 * more compatible with windows 2000

 * removed some memory leaks

 * bug fixes

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