Issue 41040

The FTP UCP does not detect and reject URLs that contain NULL
(U+0000), LF (U+000A), and CR (U+000D), either unescaped or escaped as %00, %0A,
%0D, etc.  When "ftp://host/path" is a working
URL, calling XContent.execute("getPropertyValues") to retrieve the "Size"
property on contents corresponding to the following URLs has the following
results (all string literals are in Java notation):

"ftp://host/path": success
"ftp://host/path\u0000foo": success (error: "\u0000foo" is silently dropped on
client side)
"ftp://host/path%00foo": success (error: "\u0000foo" is silently dropped on
client side)
"http://host/path\r\nfoo": success (error: garbage is sent from client to server)
"http://host/path%0D%0Afoo": com.sun.star.ucb.InteractiveAugmentedIOException ""
(error: garbage is sent from client to server)

On fixing the last three cases, see the thread at
<http://curl.haxx.se/mail/lib-2005-01/0172.html>.

Also, inspecting ucb/source/ucp/ftp/ftpurl.cxx 1.18, all code that use
curl_slist_append should ensure that it compose well-formed FTP commands (i.e.,
containing valid RFC 959 <string>s).