Fixing a bug in the require resolution algorithm.

@dwightguth please review.
You recently did some changes and removed a functionality that people were using.
You assumed that autoinclude.k is always in the /include directory, but the way I implemented the require resolution is to first look relatively to the current working directory, and then in the /include. This way, if someone didn't like the default autoinclude.k could simply create his/her own in the current working directory and control what is included and what not.