fget: Let curl follow 30x http redirects

Signed-off-by: Thomas Egerer <hakke_007@gmx.de>
fget: Remove unused 'use' statements and comments

Signed-off-by: Thomas Egerer <hakke_007@gmx.de>
fget: Correct help and make it somewhat BNFish

Signed-off-by: Thomas Egerer <hakke_007@gmx.de>
fget: Use global downloader (and verify it exists)

Signed-off-by: Thomas Egerer <hakke_007@gmx.de>
fget: Don't allow cookies at all

Script fails even if download_html stores cookies.

Signed-off-by: Thomas Egerer <hakke_007@gmx.de>
fget: Update user agent

Signed-off-by: Thomas Egerer <hakke_007@gmx.de>