Version 0.9.1

New features:

• add functions (sh-start/fds) (sh-start/ports)
• add macro (for-alist) and function (in-alist)
• add shell builtin threads to list existing threads and their status
• add thread management functions (get-thread) (thread) (thread-alive?) (thread-count) (thread-find) (thread-id) (thread-initial-bindings) (thread-kill) (threads) (threads-status)

Fixes:

• fix saving history to ~/.cache/schemesh/history.txt
• fix issue #26: flush all open C FILE* streams before fork()ing a subshell