[Feature Request] - New option needed to enable weaker authentication methods

Hi,

Since vpnc version 0.5.3.r526.r213 was released, it refuses to connect to concentrators using weaker authentication methods which results in the following error messages:

Feb 25 17:16:39 MyLaptop NetworkManager[2815]: /usr/sbin/vpnc: Peer has selected md5 as authentication method.
Feb 25 17:16:39 MyLaptop NetworkManager[2815]: This algorithm is considered too weak today.
Feb 25 17:16:39 MyLaptop NetworkManager[2815]: If your vpn concentrator admin still insists on using md5,
Feb 25 17:16:39 MyLaptop NetworkManager[2815]: use the "--enable-weak-authentication" option.

Looking at the UI, there is no way to change the authentication method to overcome this issue. I'm missing a way to select an option that passes the new --enable-weak-authentication switch to vpnc which should prevent the above error from occurring.

For more details, please check the following links:

• ArchLinux issue report: https://bugs.archlinux.org/task/77647
• VPNC commit where this feature was implemented: https://github.com/streambinder/vpnc/commit/1db1d23a6d95456dc9e4cfd7f8f4ec1f92554e75

If anything else is needed, please let me know.

Regards.