[plt-scheme] PLT Scheme v204 available

Woot!

Paul Steckler wrote:

>  For list-related administrative tasks:
>  http://list.cs.brown.edu/mailman/listinfo/plt-scheme
>
>PLT Scheme v204 is now available from 
>
>   http://download.plt-scheme.org/ 
>
>Overview
>--------
>
>  Help Desk reverted
>  openssl library added
>  channels & CML primitives added
>  SRFIs integrated
>  match.ss rewritten
>  error display improved
>
>Details
>-------
>
>- Help Desk reverted [rationale below]
>
>  We have once again reorganized Help Desk. Specifically, we
>  have resurrected and improved PLT's browser and use it to
>  provide helpful information. 
>
>- openssl library added
>
>  openssl bindings for PLT Scheme (`ssl-connect',
>  `ssl-listen', etc.) are available as an easy-to-install
>  add-on from:
>
>     http://www.plt-scheme.org/software/openssl/ 
>
>- channels & CML primitives added
>
>  PLT Scheme's concurrency primitives now include support
>  for synchronous channels and programmer-defined
>  sychronization abstractions a la Reppy's Concurrent ML.
>
>- SRFIs integrated 
>
>  The release includes all SRFI implementations from
>  Schematics: 1, 2, 4, 5, 6, 7, 8, 9, 11, 18, 19, 23, 25,
>  26, 28, 29, 30, and 31. Use
>
>    (require (lib "N.ss" "srfi")) 
>
>  to import SRFI N into a module. 
>
>- match.ss rewritten
>
>  Bruce Hauman's rewrite of the "match.ss" library removes
>  many bugs and offers several improvements. Further
>  improvements will appear in the next release.
>
>- error display improved
>
>  When a runtime error occurs and debugging is enabled,
>  DrScheme draws red arrows on the program text indicating
>  the stack at the time the error was raised. Each arrow
>  points from the source location of one activation
>  record (typically a procedure call) to the source location
>  of the next activation record.
>
>Why Help Desk has changed, again
>--------------------------------
>
>  In recent versions of PLT Scheme, Help Desk started an 
>  "external" browser (such as Internet Explorer) for reading 
>  and searching help content. Although external browsers provide 
>  better HTML rendering than our own browser, the process of 
>  managing an external browser is complex and fragile. In many 
>  subtle ways, the use of an external web browser application 
>  runs counter to Help Desk's purposes.	 Instead of continuing 
>  to fight this obstacle, we have decided to spend our time
>  improving our help-specific browser.
>
>Enjoy!
>
>-- Paul
>
>  
>