Release Strata version 2.0.0-alpha.79.
Release Strata version 2.0.0-alpha.79.

 * Upgrade `writeahead` to `0.0.11`.
 * Upgrade `turnstile` to `6.0.0-alpha.50`.
 * Upgrade `destructible` to `7.0.0-alpha.38`.
 * Upgrade `turnstile` to `6.0.0-alpha.50`.
 * Upgrade `fracture` to `0.3.0-alpha.31`.
 * Open storage in advance of creating Strata.
 * No more instances directory when write-ahead only.
 * Replace key constant with member variable.
 * Rename write-ahead read helpers.

Closes #748.

bigeasy/strata,bigeasy/strata