processed John Dalbec's fix of 2000/dlowe

Updated `bugs.html` to reflect the fix of all known bugs in `2000/dlowe`.

Added thank you to John Dalbec in `thanks-for-help.md`.

Added processing of "%%REPO_TOP_URL%%" tokens to `bin/subst.default.sh`.

Updated `find-missing-links.sh` to not falsely report missing links
when a "%%REPO_TOP_URL%%" token is used.

Changed `bin/subst.default.sh` VERSION from "1.3.2 2024-08-05"
to "1.4.0 2025-04-16".

Changed `bin/find-missing-links.sh` VERSION from "1.1.1 2024-04-28"
to "1.2.0 2025-04-16".

Due to a `pandoc(1)` bug fix, `2011/fredriksson/index.html` and
`2012/kang/index.html` were modified.  The bug fix removed extraneous
whitespace that was previously introduced into HTML under certain
situations.  These 2 changes do **NOT** impact the way web browsers
render these pages, however.

Updated sitemap.

Tested the above via `make www gen_status gen_sitemap timestamp` on macOS.

thanks-for-help.md

@@ -3556,6 +3556,12 @@ Jump to: [top](#)
 
 Cody also added the [try.sh](%%REPO_URL%%/2000/dlowe/try.sh) script.
 
+[John Dalbec](#johndalbec) fixed the remaining known bugs in
+[2000/dlowe](2000/dlowe/index.html) by causing the embedded Perl code in
+C in order to perform system-specific tune up of the C runtime environment
+necessary to run Perl interpreters.  Moreover [John Dalbec](#johndalbec)
+fixed a buffering problem by forcing a `flush(3)` after every write or print.
+
 
 Jump to: [top](#)
 
@@ -7185,6 +7191,18 @@ your help!
 Jump to: [top](#)
 
 
+<div id="johndalbec">
+### John Dalbec
+</div>
+
+[John Dalbec](authors.html#John_Dalbec) supplied a fix to
+[2000/dlowe](thanks-for-help.html#2000_dlowe).
+
+[John Dalbec's patch of 2000/dlowe](%%REPO_TOP_URL%%/pull/134)
+is a good example of [applying a minimal patch](bugs.html#general-request-on-original-code)
+to the [original 2000/dlowe](%%REPO_URL%%/2000/dlowe/dlowe.orig.c) source code.
+
+
 <div id="neglect">
 ## Did we neglect to credit you?
 </div>