This doesn't fix the krun external variable's bug but I hope it helps.
added assertion message
minor fix
fixed assertion to consider multiplicity='+'
handling multiplicity more uniformly
Fixing the symbolic backend external variables issue
for Andrei
fixed raw output for the java backend; minor refactoring in MaudeFilter
added hook to #tokenToString
Merge remote-tracking branch 'origin/master' into unified-builtins2