update bookmarks
update bookmarks

Many FTP sites no longer exist, including ftp.kernel.org:

https://www.kernel.org/shutting-down-ftp-services.html

Some other ftp sites are unreachable or something (mozilla, debian)
[filezilla can't connect either] but the web version works ok.

Some other ftp sites offer basically empty repositories (suse, rh updates)
or useless repositories (xfree)

I updated a few urls, I also added a few new interesting FTP sites (big mirrors)

masneyb/gftp,masneyb/gftp