Squashed commit of the following:

commit 43392f5f
Author: Oskar Skog <oskar@oskog97.com>
Date:   Sat Jan 22 22:12:02 2022 +0200

    Tested enough, release today

commit 91c6846f
Author: Oskar Skog <oskar@oskog97.com>
Date:   Sat Jan 22 21:43:27 2022 +0200

    Update ChangeLog and add release note

commit 88c42fac
Author: Oskar Skog <oskar@oskog97.com>
Date:   Sat Jan 22 21:29:15 2022 +0200

    Heavy load causes issues with CPython 3 on Linux

commit 37263ed0
Author: Oskar Skog <oskar@oskog97.com>
Date:   Sat Jan 22 21:18:29 2022 +0200

    Updated latest-tested

commit 34c1f8c1
Author: Oskar Skog <oskar@oskog97.com>
Date:   Sat Jan 22 21:17:22 2022 +0200

    Wrote ChangeLog entry

commit e83a265b
Author: Oskar Skog <oskar@oskog97.com>
Date:   Sat Jan 22 21:16:55 2022 +0200

    Makefile: anonymine.built should depend on version which is ALWAYS updated

commit 39ed0e6f
Author: Oskar Skog <oskar@oskog97.com>
Date:   Wed Jan 19 18:43:05 2022 +0200

    rule9bf is exponential, avoid

commit 70dd5f86
Author: Oskar Skog <oskar@oskog97.com>
Date:   Wed Jan 19 14:28:30 2022 +0200

    Add 'options' to enginecfg, add 'nice' option, change nprocs again

commit 1cceec87
Author: Oskar Skog <oskar@oskog97.com>
Date:   Wed Jan 19 12:42:46 2022 +0200

    Version 0.6.10