Racket rename
fixed .ss name in title
Racket rename
Removing saltification compat
using bcrypt
Extending cookie support with expiration

Providing access to paths on id-cookies

Change PNR to limit checksum updating unless forced
Add take-while, drop-while to racket/list
adjust gc2's mutator language so that void-producing expressions
are allowed only in places where the value is discarded
remove ->address
add in documentation for plai/gc2
unbreak get-root-set
GCalc updates.

* Lots of racket-isms.

* Add ".rktd" to the sample file.

* Fix an old bug where the large display wouldn't get refreshed.
Fix renamed file in props.
Style changes.

No need to stick with the srfi-1 style of `lis' and `recur'.  I also
removed the srfi-1 comment since this code is straightforward.  (I keep
such comments if there's something non-trivial that was taken.)
fix plai tests
raco setup, ignore this collect
scribble/srcdoc: add `begin-for-doc'
ffi/unsafe/objc

Avoid crash on duplicate Objective-C class declaration.
slideshow: add `interactive'

The `interactive' pict constructor is a hook for interactive GUI
elements on a slide. The callback associated with an `interactive'
pict gets a `frame%' instance for a frame that floats over the pict.
Remove unused argument to tc/rec-lambda/check.