make tick/tocking deterministic
lexigraphical compare on req/bid pointers
added a number of default value constructors to exchange node, and added an id on which it can be sorted, i.e., the agent id
sort->stable_sort for all greedy sorting
updated pref compare to look at equality then node ids
fixed avg pref compare
Merge branch 'det' into develop
added vect dbl support to sqlite backend
some line count semantics
Merge branch 'rwcarlsen-vdbl' into develop
added some stuff
wow, this works...
Merge pull request #972 from scopatz/lc

Better Line Count Reporting
refactors the normalize function so that summing is a separate act and can be done separate from normalization
fixed reference vs. pointer collisions
moved errant ampersand
Merge branch 'develop' into sum_comp
changes indices
fix python 3 bug
refactor composition kahn sum op into compmap::Sum func