Add a `resource/referrer' abstraction for referrers, on top of plain
resources. (When the referrer is `values', it just returns the plain
resource.) Also add `url-of' to replace `get-resource-path'.
Ie, the difference between using it as a language and as a module is now
the same in both. Also, improve `scribble/html' (and
`scribble/html/htmllang') by reproviding most of the corresponding text
modules.
Change `meta/web' accordingly, and improve code by making a new langugae
(`#lang meta/web'). This language is similar to `scribble/html' except
that it uses the plain scribble reader (not the `-inside' one), it
doesn't use the customized module-begin feature (that uses
`output-xml'), and it adds all the relevant bits of `meta/web/common'.
(Also, "meta/web/common.rkt" is gone, since it's used only as a language
now.)
This commit has lots of details and binding games, so it's tricky, and
potentially caused some problems. (Took me a while to track many
breakages, so I won't be surprised if there are more.)
* Remove all uses iplt from svn, replaced with a new iplt repository in
git.
* The previous approach to patching pre html files wasn't robust enough,
in case of a problem in the web page build things could be left with
the raw html pages. Replace that with a better solution, which
generates the web pages earlier and then uses them to patch the html
files.
* Add the drracket.org redirection page to the distribution list.
* Fix a small bug in the git intro page css.
