Adds set data structure to dttools.
Adds sink/source interface functions for the dag.
Explicit ancestor/descendant nodes in makeflow.
Adds testing for set data structure.
Fixes get_line bug, static buffer returned.
Fixes path of set test.
Fixed bug in handling of a 32-bit execve on a 64-bit program.
This fixes a bug reported by Stefan Kluth when using ATLAS
software via CVMFS.
Changed micro field of version to string.
Use size of incoming file when checking if the available disk space is within
the specified threshold.