Fix memory issues for larger sample sizes

[jaamarks]

Fixes #241 . Make changes to handle larger sample sizes.

• change some resource parameters,
• switch some local rules to jobs submitted to cluster,
• adjust time allocation formatting for compatibility with the Slurm scheduler to accept durations exceeding 24 hours,
• increase ibd_min_pi_hat parameter from 0.05 to 0.12 with corresponding updates to unit tests,
• and fix minor bugs.