* added sort testing program
* added GraphEdge class
implement parallel in place sorting
add InPlaceParallelSort class
implement alternative in place parallel sorting
add GraphEdgeBuffer class
* add valueAtLeast filter function for SimpleHashMap class
* add GraphEdge I/O and sorting classes
add GraphEdge I/O classes to Makefile.am
remove broken valueAtLeast methods from SimpleHashMap
remove redundant checks for BAM alignment entry validity
add parallelised computation of prefix sums for AutoArray class