I defined some things I will use often. At the moment I do something like:
    \input /home/cecil/Documenten/context/include/standard-init.inc

But I would prefer to do something like:
    \input standard-init.inc

Is shorter and when the path changes there is nothing to update.
How should I implement this?

Also is it possible to \input a file relative to the current document?

For example in my standard-init.inc I have:
    \ctxloadluafile{/home/cecil/Documenten/context/include/lua/getdate}
but I would prefer something like:
    \ctxloadluafile{lua/getdate}