ea: Use sorted array both in display and download

Signed-off-by: Thomas Egerer <hakke[underscore]double-oh-seven[at]gmx.de>
ea: Add usage function and call it if no args are given

Signed-off-by: Thomas Egerer <hakke[underscore]double-oh-seven[at]gmx.de>
ea: Update user agent string

Signed-off-by: Thomas Egerer <hakke[underscore]double-oh-seven[at]gmx.de>
ea: Add dry-run mode (-d)

Signed-off-by: Thomas Egerer <hakke[underscore]double-oh-seven[at]gmx.de>
fget: Update user-agent string

Signed-off-by: Thomas Egerer <hakke[underscore]double-oh-seven[at]gmx.de>