rewrite bin/tar-entry.sh

We rewrote the `bin/tar-entry.sh` algorithm so that we do NOT have
to require Linux to produce a compressed tarball that is byte-for-byte
identical to a macOS compressed tarball for the same entry.

Changed `bin/tar-entry.sh` VERSION from "1.2 2024-03-22"
to "1.3 2024-03-25".

Added `bin/untar-entry.sh` to untar an entry from the
compressed tarball.

Added `make untar_entry_tarball` to untar all entry files.

Added `make untar_year_tarball` and `make untar_all_tarball`
stub Makefile rules.  The core it referred to does not yet exist.

Updated IOCCC manifest.  Updated `.entry.json` for `2004/sds`.

Performed `make www` to update web pages.  In most cases the
entry `index.html` added an inventory link for the new `.tar.tstamp` file.

Performed `form_entry_tarball` to complete the test of the above.

TODO: Test the results under Linux.

TODO: Update `bin/tar-year.sh`.  Update year level compressed tarballs.

TODO: Update `bin/tar-all.sh`.  Update top level compressed tarball.

TODO: Write `bin/untar-year.sh` and `bin/untar-all.sh`.

tmp/manifest.csv

@@ -2182,6 +2182,7 @@
 2004,sds,Makefile,30,true,makefile,true,entry Makefile
 2004,sds,sds.orig.c,50,true,c,true,original source
 2004,sds,try.sh,100,true,shellscript,true,how to run
+2004,sds,README_sds.txt,200,true,test,true,sample data used by try.sh
 2004,sds,2004_sds.tar.bz2,100000,false,tbz2,false,download entry source
 2004,sds,index.html,2000000000,false,html,false,entry home page
 2004,sds,README.md,4294967295,true,markdown,true,markdown source for index.html

tmp/path_list.found.txt

@@ -2184,6 +2184,7 @@
 2004/sds/2004_sds.tar.bz2
 2004/sds/Makefile
 2004/sds/README.md
+2004/sds/README_sds.txt
 2004/sds/index.html
 2004/sds/sds.c
 2004/sds/sds.orig.c

tmp/path_list.manifest.txt

@@ -2184,6 +2184,7 @@
 2004/sds/2004_sds.tar.bz2
 2004/sds/Makefile
 2004/sds/README.md
+2004/sds/README_sds.txt
 2004/sds/index.html
 2004/sds/sds.c
 2004/sds/sds.orig.c

tmp/path_list.required.txt

@@ -1462,6 +1462,7 @@
 2004/sds/.gitignore
 2004/sds/Makefile
 2004/sds/README.md
+2004/sds/README_sds.txt
 2004/sds/sds.c
 2004/sds/sds.orig.c
 2004/sds/try.sh