CRISPRme+ 2.2.0-alpha.13

Alpha release for beta users. Docker: docker pull pinellolab/crisprme:v2.2.0-alpha.13 (multi-arch amd64 + arm64)

Performance follow-up to alpha.12's genome-wide post-analysis memory fix (no behavior change):

Changed

• ijson now uses the fast yajl2_cffi C backend (added yajl + cffi) instead of the
  pure-python fallback — much faster streaming of the per-chromosome SNP dictionary.
• Post-analysis runs chromosomes in parallel again. With streaming, per-worker peak RAM is
  small (chromosome genome string + queried subset), so the worker cap uses a modest fixed
  estimate when ijson is available instead of sizing from the (large) dictionary file — which
  had been serializing to a single worker. The INDEL pool likewise (it reads the small
  log_indels, never the big dictionary).

(alpha.12 remains the crash-fix release: genome-wide variant post-analysis OOM + the on-demand
INDELS double-prefix regression. alpha.13 only makes that post-analysis fast.)