File and Memory Optimization

[noahares]

This PR improves 2 things:

1. Reduced memory usage during reconciliation sampling: No longer keep all reconciliations across all families around to estimate originations, but update them for each family after it is sampled.
2. Change most output files to TSV: This makes it easier to process files inside alerax and also unifies the output format. Added headers where they were missing and changed "," to "\t" for the files that were csv-like. This will break some post-processing scripts but is the preferable long term solution for output files. That's why I increased the AleRax version string.

This PR involves no functional changes.