Add SBLGNT trees

[ryderwishart]

Overview

This PR adds a version of the macula-greek syntax trees based on the SBLGNT.

@RickBrannan and @ryderwishart did the bulk of the work to get the Nodes and Lowfat versions of the syntax trees built. @jacobwegner added TSV and TEI exports that mimic what was already offered for the Nestle1904 version of the trees (via #80, #81, #84)

Subtasks

• [x] Nodes trees in macula-greek format (without head word attributes bubbled up to ancestor wgs
• [x] Lowfat trees in macula-greek format
• [x] Ensure SBLGNT trees do not exhibit any data loss (aside from textual variants) when compared with N1904 trees
• [x] Make sure SBLGNT lowfat attributes are named appropriately
• [x] Add sblgnt/tei for compatability with the existing Nestle1904 data (@jacobwegner)
• [x] Remove extra TSV href files if we don't want those

[jacobwegner]

@ryderwishart I added a TODO above for the TEI.

Were you thinking of generating a TSV as well at some point?

[ryderwishart]

Were you thinking of generating a TSV as well at some point?

@jacobwegner Yes, I was planning on regenerating the TSV after the lowfat, as the TSV currently comes from the lowfat trees (IIRC).