Large Transfer Fix

Upon attempting to transfer rather large indexes, a nil pointer exception was exposed due to average calculations.

04568f6

Master hotfix

After testing escp on significantly large indexes, we uncovered some issues that needed fixing.

This revision is functional but does contain a bug in the average chan send time calculation.

Using esdiff shows escp copied indexes are valid.

v1.0

Locking down production capable escp and esdiff tools to a tag before more changes/tools come down the pipe. Credit to @schmichael for building and testing the tools.

Future tags/releases will have a vendor.json, but no changes in dependencies from this tag to newer ones.