Fixed double opening of action=FOLDERS whe clicking "Import archive" (closes #3703)

When the "Import archive" menu was clicked, a new window was opened with
`app=FREEDOM&action=FOLDERS` in it.
Merge pull request #715 from eguaj/3.2-A3703

Fixed double opening of action=FOLDERS whe clicking "Import archive" (closes #3703)
Change checkDate function to accept older date even in 32bit (closes #3720)