Multisites: date range selection in the calendar should be the largest possible,

[matt]

Reported on  the forum

if i was on the Dashboard of the new site on "today" and then i go to All sites, i am not able to select a date before today because the calendar doesn't offer any links on thoses days.

As a "workaround", i just need to go back to the dashboard, select another site from the site selection drop down (that is stil a bit buggy for me) and then return to All sites and i'm able to back track the stats.

Two things to fix:

• the link to the website report should never be for a date before the starting date. If a date before the starting date is selected, the report date should instead be the starting date for this website.
• the calendar minimum date should be the older starting date for all websites shown in the multi sites report

[vipsoft]

[1797], refs #1087

[matt]

(In [1934]) Fixes #1087 Minimum date in the calendar on the All Websites dashboard is the min date across all websites