Ann: interpolate pack

With Jan's 6.5.1 release, I thought I'd put
prolog_load_context(variable_names,_) through its paces.  I've release a
pack that implements shell-style string interpolation for Prolog.  You can
read the full documentation<http://www.swi-prolog.org/pack/list?p=interpolate>for
details.  It's pretty much what you'd expect:

    Name = "Michael",
    Valediction = 'Goodbye, $Name'

Interpolation works inside atoms, double quoted strings and backquoted
strings.  Of course, you often get singleton warnings, so I'll probably
implement a quasiquotation variant at some point.

-- 
Michael
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