add tools to compare entry's manifest with its files

Added `bin/bin/tar-entry.sh` to build a compressed tarball for an
entry.  The compressed tarball is formed by gnu tar with options
so that the same entry file content will always produce the same
compressed tarball, byte for byte.

As some files are missing from some entries, one should
use the `-W` option as in:

```sh
bin/tar-entry.sh -v 5 -W 2020/ferguson1
```

Added `make form_entry_tarball` to the top level `Makefile`
to build entry tarballs even when files are still missing.

Added `make verify_entry_files` to verify that all entries have all
of their files listed in their manifest, plus the top level ioccc.css
and var.mk files.  As file entry files are still missing (due to
HTML files that need to be built), the overall `make quick_www` and
`make www` do **NOT** (yet) exit when the `make verify_entry_files`
fails.

Improved `bin/chk-entry.sh` by removing some variables
that were not needed.

TODO: Improve `bin/` tool exit codes as the current use is a bit silly.

TODO: Clean out some variables used in `bin/` tools as some of then
are only set printed in debug statements.

TODO: Clean up usage messages, some of the options listed to not
match the `getopts(1)` parsing.  In some cases the option needs to
be parsed but needs to be ignored by the tool because another tool
automatically passes along certain options that really have no
effect.  Such ignored options need to be show as "This option is
ignored" in the usage message.

Makefile

@@ -53,6 +53,8 @@ GEN_AUTHORS= bin/gen-authors.sh
 GEN_LOCATION= bin/gen-location.sh
 GEN_YEARS= bin/gen-years.sh
 GEN_YEAR_INDEX= bin/gen-year-index.sh
+CHK_ENTRY= bin/chk-entry.sh
+TAR_ENTRY= bin/tar-entry.sh
 README2INDEX= bin/readme2index.sh
 QUICK_README2INDEX= bin/quick-readme2index.sh
 
@@ -233,8 +235,8 @@ indent.c:
 # XXX - The rules in this section are undergoing development and change.
 #	They might not even work (right now).  :-)
 
-.PHONY: help genpath gen_authors gen_location gen_years entry_index quick_entry_index \
-	gen_year_index quick_www www
+.PHONY: help verify_entry_files genpath gen_authors gen_location gen_years \
+	entry_index quick_entry_index form_entry_tarball gen_year_index quick_www www
 
 # Suggest rules in this section
 #
@@ -243,6 +245,7 @@ indent.c:
 # reminder to hose who to understand.  For all else, there is "RTFS". :-)
 #
 help:
+	@echo make verify_entry_files
 	@echo make genpath
 	@echo make gen_authors
 	@echo make gen_location
@@ -250,9 +253,17 @@ help:
 	@echo make entry_index
 	@echo make gen_year_index
 	@echo make quick_entry_index
+	@echo make form_entry_tarball
 	@echo make quick_www
 	@echo make www
 
+# check to be sure all files in all entries exist
+#
+verify_entry_files: ${ALL_RUN} ${CHK_ENTRY}
+	@echo '=-=-=-=-= IOCCC begin make $@ =-=-=-=-='
+	${ALL_RUN} -v 3 ${CHK_ENTRY}
+	@echo '=-=-=-=-= IOCCC complete make $@ =-=-=-=-='
+
 # form the top level .top, YYYY level .year and winner level .path files
 #
 genpath:
@@ -319,6 +330,17 @@ quick_entry_index: ${ALL_RUN} ${QUICK_README2INDEX}
 	${ALL_RUN} -v 3 ${QUICK_README2INDEX} -v 1
 	@echo '=-=-=-=-= IOCCC complete make $@ =-=-=-=-='
 
+# form all entry compressed tarballs
+#
+# XXX - We also use -W because some entry files don't yet exist - XXX
+# XXX - Remove -W when make verify_entry_files runs without err - XXX
+# XXX - We do not yet form year level and the top level tarball - XXX
+#
+form_entry_tarball: ${ALL_RUN} ${TAR_ENTRY}
+	@echo '=-=-=-=-= IOCCC begin make $@ =-=-=-=-='
+	${ALL_RUN} -v 3 ${TAR_ENTRY} -v 1 -W
+	@echo '=-=-=-=-= IOCCC complete make $@ =-=-=-=-='
+
 # do work to build HTML content for the web site
 #
 # This rule uses quick_entry_index, not slow_entry_index, so
@@ -329,10 +351,12 @@ quick_entry_index: ${ALL_RUN} ${QUICK_README2INDEX}
 #
 quick_www:
 	@echo '=-=-=-=-= IOCCC begin make $@ =-=-=-=-='
+	-${MAKE} verify_entry_files # remove - when all files exist
 	${MAKE} gen_authors
 	${MAKE} gen_location
 	${MAKE} gen_years
 	${MAKE} gen_year_index
+	${MAKE} form_entry_tarball
 	${MAKE} quick_entry_index
 	@echo '=-=-=-=-= IOCCC complete make $@ =-=-=-=-='
 
@@ -342,10 +366,12 @@ quick_www:
 #
 www:
 	@echo '=-=-=-=-= IOCCC begin make $@ =-=-=-=-='
+	-${MAKE} verify_entry_files # remove - when all files exist
 	${MAKE} gen_authors
 	${MAKE} gen_location
 	${MAKE} gen_years
 	${MAKE} gen_year_index
+	${MAKE} form_entry_tarball
 	${MAKE} entry_index
 	@echo '=-=-=-=-= IOCCC complete make $@ =-=-=-=-='