Merge pull request #147 from linas/link-grammar

test case bug fixes
executionlink: be freindly, trim whitespace
guile: simplify error string printing
scheme: make output printing more freindly

In particular, make deugging ExecutionLinks easier.
Fix misleading error message.
work around atomspace broken-ness
fix crazy whitespace indentation problems
add test for atomspace bug.
Merge pull request #149 from linas/pattern-dbg

Pattern matching beautification