Client interface improvment

[samuel]

@eura note that you also have the option described here:

How to conveniently switch between different user profiles

Different user profiles for the ThinLinc client can be useful when regularly connecting to multiple different ThinLinc servers, e.g. to save the hostname of the server, swap between different authentication methods or use different levels of security restrictions. This guide shows two ways to create such user profiles. ThinLinc handles user profiles through files called tlclient-files, which in this text will be referred to as user profile files. In short, these files are configuration files th…