Removes newline from work queue version string.
Implements the clustering stack.

cluster reads a set of summary files, and tries to group tasks
according to their resource usage.
Added function to collect the summaries of a cluster.
Automatically generates the gnuplot command for stacked
histograms.
Adds the distance between clusters as an argument.
free list of input files
remove unnecessary malloc
Merge pull request #3 from rampantmonkey/memory-management

Memory management fixes in linker rename.
Reformat work_queue_catalog reporting function.