fixed a @file-is mistake, race?
Fix doc typos
bundle script: fixes for "README" munging
planet2 docs: move and tweak expanation of package-library `require'
add a checkbox to disable online expansion in the preferences dialog

(it controls the same state as clicking in the circle in
the bottom right corner of the drracket window)
More matrix documentation
clean up autosave a little

guard more of the filesystem manipulations with
handlers and log errors instead of letting them
be raised and show up as internal errors

related to PR 13403
adjust the framework to avoid
calling the error-display-handler when reporting
problems saving files

closes PR 13403
Fixes PR13406
fix problems with single-flonum (versus flonum) results

The problems were with

 * `sqrt' and `expt' on single-flonum complex numbers
 * `asin' and `acos' on single-flonum arguments and complex results
 * `atan' on mixtures of single-flonum and exact arguments
 * `gcd' on mixtures of single-flonum and flonum arguments
math/matrix: fix some duplicate documentation tags
try to make this test's timing better behaved
batch io functions now accept 'standard-[in,out] in lieu of file name
adjust scribble/lp language so drracket syntax colors it properly

Also fix a spelling mistake (now that spell checking works) and Rackety
change chat noir so that 'h' toggles help

(instead of requiring it to be pressed down all
the time, as that generates lots of extra events)
supporting http proxy (without authorization) during make install
setup/configtab: prevent cross-module inlining of configuration

The intent is that the configuration module can be rewritten without
recompiling code that uses it, so don't let the compiler inline
configuration values.
minor README correction
raco exe: yet another submodule repair

Closes PR 13410
guard call to file-or-directory-permissions

related to PR 13359
also, Rackety