basic structures for batch management
add insert function to batchTree
add delete function to batchTree
move file.go into batch.go and batch_tree.go
basic tests for batchTree, with a few bugfixes
remove existing disk structure
add random selection of sector from stack
add whole slew of tests, fix whole slew of bugs
add comments indicating slow tests that are not skipped in 'make test'
Merge pull request #117 from DavidVorick/files

Batch Tree