CVS log for modules/gci/buildlastlogindb.pl

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- Customization for GCI_3.
- Populate nohist_crslastlogin.db and nohist_submissiontracker.db files
  from stored data for courses in gcitest domain.
  - Two uses:
    (a) extraction of t data for sessions/submissions from before
        installaton of lonroles.pm rev. 1.240.2.15 and
        structuretags.pm rev. 1.461.2.1.
    (b) recovery from "permanent" data in course of corruption of
        course's nohist_crslastlogin.db or nohist_submissiontracker.db