move "scriblib" from "racket-doc" to "scribble-lib"
count ".scrbl" files as modules within a package

The set of relevant extensions should be made extensible, eventually.
move Scribble tests to "scribble-test"
adjust the places <-> distributed-places connection

Instead of a dynamic-require, the connection goes through a
structure-type property on a `remote-note%' instance.
move `planet/resolver' back to core

In consultation with Sam, partially reverts efba034e01. The default
module name resolver uses `planet/resolver' for the build-in
`(planet ....)' form. The `raco planet' command is still in
"planet-lib", though.
typo
update for moved drracket tests
fix (I think) a redrawing problem with the 102 chars column guide
fix `raco exe'
add "share", move "collects" back out of "lib", move "pkgs"

The "share" directory holds platform-independent files, while
"lib" holds platform-specific files.

In principle, the "collects" directory belongs in "share",
as does "doc". Those directories are put into "share"
by a Unix-style install, but left at top level for an
in-place install.

Packages in installation scope are put in "share" instead
of "lib", and the top-level Makefile puts development links
in "share/devel-pkgs".

The `configure' script now supports `--docdir' and `--collectsdir'.

Changed the version to 5.90.0.1.
distro-build: add support for source installers
fix problems with "collects" path and GUI executables
Remove extraneous syntax-class.
Minor optimizer cleanup.
fix "meta/props" for test-file moves
explicit flush after output intended to report progress
Fix typito in INSTALL.txt
Add ffi array-type and in-array
add catalog, source, and Mac OS X instructions to basic README

Also, include "stamp.txt" and "collects.tgz" at a build site.
fix "etc" vs. "config" in `make install' step