#57 Can't connect via https

[Wart]

Connections to servers via https urls doesnt' work.

Steps to reproduce:

1) Add the server
"https://discover.gridservice.info/xmlrpc" to the
server list.
2) Right-click on the server and select "List methods"

Expected behavior:

After a short delay, the server's services are listed
in the server tree view.

Observed behavior:

After being prompted to accept the server's
certificate, a dialog appears that says "the web site
you want to connect requests identification. Select
the certificate to use when connecting." The list of
certificates is empty. Pressing either 'Cancel' or
'Ok' results in another short error dialog.