Version 0.15.7

Breaking changes:

• SimpleGQL: no longer takes the schema_file and graph as regular arguments, but
  as --schema-file and --data-tag instead.
• Rename ZEFDB_CONFIG_PATH to ZEFDB_SESSION_PATH
• schema zefop renamed to blueprint

New features:

• SimpleGQL:

  • all main module arguments can be passed as environment variables,
    e.g. instead of --schema-file you can use SIMPLEGQL_SCHEMA_FILE.
    Commandline args take priority.
  • --init-hook option to run a hook on every startup
  • @dynamic(hook: "...") option for field resolvers

• Tokens are cached in the session directory

• Dictionary syntax for graph wishes: {ET.Something: {RT.A: 3, RT.B: 4}}

• set_field operation for atomically updating "fields"

Fixes:

• login auth flow was broken for the new default of statically built libzef.