llocByNoc and llocByNom Notices

When you try and output a historic CSV as per the readme you will get a lot of notices such as this:

```
PHP Notice:  Undefined index: llocByNoc in /var/www/phploc/src/Log/CSV/Single.php on line 148
PHP Stack trace:
PHP   1. {main}() /var/www/phploc/phploc:0
PHP   2. Symfony\Component\Console\Application->run() /var/www/phploc/phploc:64
PHP   3. SebastianBergmann\PHPLOC\CLI\Application->doRun() /var/www/phploc/vendor/symfony/console/Symfony/Component/Console/Application.php:124
PHP   4. Symfony\Component\Console\Application->doRun() /var/www/phploc/src/CLI/Application.php:135
PHP   5. Symfony\Component\Console\Application->doRunCommand() /var/www/phploc/vendor/symfony/console/Symfony/Component/Console/Application.php:193
PHP   6. Symfony\Component\Console\Command\Command->run() /var/www/phploc/vendor/symfony/console/Symfony/Component/Console/Application.php:887
PHP   7. SebastianBergmann\PHPLOC\CLI\Command->execute() /var/www/phploc/vendor/symfony/console/Symfony/Component/Console/Command/Command.php:252
PHP   8. SebastianBergmann\PHPLOC\CLI\Command->executeHistory() /var/www/phploc/src/CLI/Command.php:147
PHP   9. SebastianBergmann\PHPLOC\Log\CSV\History->printResult() /var/www/phploc/src/CLI/Command.php:248
PHP  10. SebastianBergmann\PHPLOC\Log\CSV\History->getValuesLine() /var/www/phploc/src/Log/CSV/History.php:68
PHP  11. SebastianBergmann\PHPLOC\Log\CSV\Single->getValuesLine() /var/www/phploc/src/Log/CSV/History.php:84
```

It would appear that llocByNoc and llocByNom have been removed from the available stats but not the csv writer. This pull request just removes them from the CSV writer.