My 1billion row challenge solutions in various languages

Add a script to transform output into CSV format

It is useful to debug differences between implementations, e.g.:
```sh
$ while ./create_measurements.sh 1000 && diff <(./calculate_average_royvanrijn.sh 2>/dev/null | ./tocsv.sh) <(./calculate_average.sh 2>/dev/null | ./tocsv.sh) ; do echo OK; done
Created file with 1,000 measurements in 50 ms
60c60
< Bucharest;-2.9;2.9;6.1
---
> Bucharest;-2.9;2.8;6.1
265c265
< Petropavlovsk-Kamchatsky;0.9;9.3;17.7
---
> Petropavlovsk-Kamchatsky;0.9;9.2;17.7
```

For #14

Changed files
+32
+32
tocsv.sh
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#!/bin/sh
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#
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# Copyright 2023 The original authors
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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exec sed '
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#
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# Transform calculate_average*.sh output into semicolon-separated values, one per line.
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#
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# 1. remove "{" and "}"
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s/[{}]//g;
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# 2. replace "=" and "/" with semicolon
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s/[=/]/;/g;
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# 3. id may contain comma, e.g. "Washington, D.C.;-15.1;14.8;44.8, Wau;-2.1;27.4;53.4"
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# so replace ", " with a newline only if it is preceded by a digit
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s/\([0-9]\), /\1\n/g
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'