Improvments for validation

-Hazard parameters moved to community initialization
-GQ hazard updated to reflect community hazard parameters
-Various graph cleaning and verification
Added ABC Parameter Inference script
int / str bug fix
ABC algorithm enhancements

-distance function improved
-relationship durations made a function of couple mean age
ABC printing bug fix and pop scale up
ABC expanded to include additional data points
fixed syntax error
fixed syntax error (again)
Enhancements for ABC Parameter Inference

-Additional graph for posterior distribution
-Additional graph for distance distribution
-Additional parameter to be inferred: DNPshape
-Duration scale and shape renamed
Added script for distributed computing
Improved documentation and graphs
Bug fix for intergenerational_sex_data in GraphsAndData
Deleted README.txt in favor of .md
Cleaning up

-Scripts added to scripts subfolder
-Agent class moved to Community module
-*.csv added to gitignore
-Changes.txt added to reflect the addition of ABC