default for enddate parameter too small

[mortee]

in linkifyer.js​' at the end of the linkify() function, the default value for the enddate parameter seems to be too small. At least in my instance, time values are in the 1.2e15 range, whereas the deafault enddate, which should be bigger than currently common dates, is just 2e9. Because of this, if I don't specify an end date, all my reports are empty.

[Russ Tyndall]

(In [8260]) Add report group descriptions on management page. Fixed too small default end date (version 1.0.4) fix #7368 and #7369