Emakefile in examples
parallel bugs!

When finding a new bug we also try to permute the command sequence (in a
limited way) to see which permutations also fail the test. We use this
information to construct a bug which may contain a par construct
{par, Cmd, Cmds} indicating that Cmd can appear at any point in the list
Cmds.

Still todo: subsumption of parallel bugs.
tests for parallel matching
added forgotten subst_dict.erl