Add ability to see example output from top level by using 'make check-examples RUNPIPE='
Guile example makefiles - run some of the examples in the check target.
Still some are missing. Add some missing examples to check.list.
Ocaml example makefiles - run examples - there are plenty of problems currently though
Pike - a few updates to get Pike 7.8 running most of the examples
Mzscheme - fix for running examples during 'make check-examples' - they don't run very well though\!
Chicken - make check-examples run like other examples - not all run very well though!