[DS-1230] Add a tool to load last-login dates from dspace.log.*
Commandline operation to list or delete disused accounts
Make stdout clean TSV
Display last-active date too, and change errant space to tab
Clean up, document code
Further tidying
[DS-1230] Better date handling, give example date.

Thanks to Pascal-Nicholas Becker for bug spotting and suggesting the
example, and Ivan Masár for suggesting how to generate the localized
sample.
[DS-1230] Fix column name, iterator control.
[DS-1230] Add 'pretend' option to the log loader
[DS-1230] Replace system properties with proper commandline options
[DS-1230] turn off AUTHZ properly.
Merge pull request #497 from mwoodiupui/DS-1230

[DS-1230] Aging tool to discover disused accounts