add tools to compare entry's manifest with its files

mirror/ioccc

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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.

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