Enhanced Stats On BO Index v2.2

Adds number of carts and visitors on the BO index page and makes all links clickable.CHANGELOG:
v2.2 (2011-03-17)
[*] Fixed language strings in install files.
v2.1 (2011-03-10)
[*] Updated for new 1.4 AdminHome file.
v2.0 (2011-01-30)
[*] Updated for PrestaShop 1.4 code.
v1.1 (2010-07-20)
[+] Include clickable links, adjusted width.
v1.0 (2009-10-22)
[+] First release to the PrestaShop community.