:   '''[thread]::create''' ?'''-joinable'''? ?'''-preserved'''? ?''script''?

Creates an interpreter in another thread. That interpreter will have the [thread] [package] pre-loaded into it, and will be the master interpreter for that thread. If supplied, ''script'' will be evaluated within the new interpreter; otherwise a default script (containing just `[thread::wait]`) will be used.

Returns the ID (as in [thread::id]) of the newly created thread.

----
''[[TODO: Document the '''-joinable''' and '''-preserved''' options.]]''

**Bad Interaction With Tailcall**

[AMG]: At least in Tcl 8.6.9 on x86_64 Linux, [[thread::create]] and [tailcall] do not seem to agree.  I hoped I could create and initialize a thread like so:

======
set thread [thread::create [list apply {{auto_path} {
    set ::auto_path $auto_path
    package require myPackageHere
    tailcall thread::wait
}} $auto_path]]
======

However, when it comes time to release or cancel the thread or outright exit the program, sometimes it SIGSEGVs, locks up, aborts due to "FlushChannel: damaged channel list", or aborts due to double free or other corruption.  And sometimes it even works!  Totally random.

Instead, I have to create and initialize the thread using separate commands:

======
set thread [thread::create]
thread::send $thread [list set auto_path $auto_path]
thread::send $thread {package require myPackageHere}
======

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