ScriptFu test directory, framework, and tests
Initial work on test framework for ScriptFu.
See discussion at #9755 (closed)
The plan is to add a test for:
- any new issue and fix.
- any enhancement
- any new PDB procedures
And to gradually add tests for existing TinyScheme and PDB
The check.scm framework here is SRFI-23 hacked to use TinyScheme macros. I will probably delete it unless someone improves it. I prefer a smaller test framework rather than trying to fix the check framework.