Make html validate for three files

One general change to the theme, to remove the deprecated attribute on div tag used for "opentag".

The changes for aliases.cgi were minor and easy to do.

The changes for connections.cgi were more time consuming.

The changes for index.cgi were most time consuming, the html there was not too nice, several tables, rows, columns where not properly closed.

I doubt it will be worth the effort to make all cgi files pass html validation, but I think the cleanup of the index.cgi file was worth the effort, and I was also able to add some minor new functionality, like viewing "no active connections" for "IPSec" case, like it is currently done for OpenVPN.