adding expansion
adding parallelism to loops in eccentricity, ecc_dist and expansion
adding expansion to test
Merge remote branch 'upstream/master'
Merge pull request #25 from spowers/master

Adding parallelism to eccentricity, ecc_dist and expansion
Merge pull request #26 from MattBBaker/master

Parallel build fixups and compiler fixup
Adding new gconvert utility for conversions between file types; removing old X2Y utilities
Merge branch 'master' of github.com:jlothian/INDDGO-survey
Adding a #define for INDDGO_INFINITY (used in shortest path calcs)
Adding avg shortest path length calculation; updating djikstra stuff to use  INDDGO_INFINITY
Adding avg_path_length to graph_stats driver
cleaning up code
fixing icc error
output the input filename in the stats file
change \n to endl for better monitoring of progress during batch jobs
Add Petsc and Slepc options to build system
Initial version of eigen spectrum solver
Bug fixes.
spelling errors
sorted out merge of graph_stats.cpp