configure test for shell pipefail feature
set some piped commands to pipefail
use pipefail in test scripts, replace cat with input redirection
update line count script
unique_list no longer linear search
Merge branch 'master' into run-time-expressions
digraph SCC algorithm
Merge branch 'master' into run-time-expressions
implement digraph transitive closure
initial implementation using transitive closure of digraphs
cyclic atomic dependency check, initial implementation
update tests to use 'ebool'
fix projection of graph onto ports, check for self-loop edges forming singleton SCCs
documentation for run-time atomic expressions
add missing headers to source list for distribution
added test case source to dist list