- Made package multi-archive aware. Numerous changes across most files. ...

- Fixed bug in inc.class.mysql.es.php that meant that eprint ID 1 could never
  be displayed.
- Fixed bug in inc.fns.merge.es.php that caused fractional years to be
  generated.

- Switched navigation bars to use global actions/includes array in ...

inc.vars.es_src.php instead of manually including files.
- Fixed a display bug with the "Last year" navigation bar item that caused
  it to erroneiously highlight "Last year" when you were actually viewing
  a single month from last year.

- Added intelligent navigation bars. ...

- Made all paths relative.