Constrain program to 1-99 parties

Currently, the program allows the user to tally for one party by default by just running:

```
./tally
```

and then entering `1` for each tally for that party. However, it also supports entering an argument of the number of parties, such as:

```
./tally 3
```

and then entering values `1` or `2` or `3` to tally for those respective parties.

**However** we want to constrain this argument so that any value given for `argv` that is provided that is *outside* of the range **1 to 99**, instead of running the tallying process, it should just print the error message:

```
usage: ./tally []
- number of parties to tally (1-99). Default = 1.
```

and then terminate the program.

Start at the program entry point that reads argv and trace how the party count is parsed before tallying begins. Check the existing ./tally and ./tally 3 behavior, then verify that values below 1 or above 99 print the specified usage message and terminate without tallying.

Written by the indexing model from the issue text.