Handlers for tree-id.json

• Relates to assigning of unique IDs to large logic trees with mixed feature IDs.
• Also update docs in nshmp-haz for tree-id.json

changed milestone to %nshmp-haz 2.0 Sprint 3 - provisional release

assigned to @pmpowers

changed title from Handlers for tree-info.json to Handlers for tree-id.json

changed the description

mentioned in merge request !193 (merged)

mentioned in commit e360c424

closed with merge request !193 (merged)

Model mining has shown we do not always want to rely on the enclosing directory name of a source tree and so we want a name field as well and the file should be tree-info.json

reopened

mentioned in merge request !194 (merged)

mentioned in commit d535d4a3

closed with merge request !194 (merged)