OIL version 2.3

Changes:

• OIL comes with a standard library folder called lib (previously called examples)
• The call command (14) will now try locating a file in the standard library folder, if it can't find it in the current working directory.

This is a minor breaking change, as previously skipped call commands might be executed, but all examples of scripts whose behavior breaks from 2.2 to 2.3 are pretty pointless (as they would have relied on the non-existence of a script in their own working directory). Every minor release that adds commands would have a higher chance of breaking anything. (This is OIL. Expect breakage if you rely on low-ish numbers nopping.)