Behaviour when server not available

[joto]

It is unclear what the behaviour of the Lua code should be when the server is not available either when first connecting or when the connection fails at some point. In some contexts it might make sense to keep going and not transliterating names (for instance when this is for temporary map views only, when it is more important to show something rather than an error or so), in other cases it might make more sense to stop processing with an error or wait and retry.

To solve this properly I think we need to expose this to the "user code". So instead of magically connecting to the server when the library is loaded add an explicit init or connect call or something. If that fails the user code can then decide what to do. Similarly there should be a defined error return from the libary calls, probably using the standard Lua pcall mechanism.

[giggls]

I think we should probably add a lua connection function. If this one is called we can set a transcript-connection=true variable and all daemon communication errors are real errors afterwards. If it is not called we simply return the non-latin input string.