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Round outputs #7

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Round outputs #7

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Commits on Aug 5, 2022

  1. Decimal outputs can be rounded 

    Adds a command line argument to specify whether to round the outputs
(and to how many decimal places).

```
  -R ROUND_TO, --round-to ROUND_TO
                        number of digits to round outputs to
```

This addresses two rough edges with models that produce decimal
outputs. Firstly they may produce outputs with spurious or
uninteresting accuracy, secondly floating point arithmetic may produce
unhelpful decimal representations. Both are apparent in the example
below.

Without rounding:

```
$ cat pipeline.sys | systems-run | cut -f1,14- | expand --tabs=20
                    Options             Initiatives         Deliverables        Observables         Done
0                   0                   0                   0                   0                   0
1                   5                   0                   0                   0                   0
2                   6                   2                   0                   0                   0
3                   6                   2                   2                   0                   0
4                   5.94                2.0                 2.16                1.8                 0
5                   6.832000000000001   2.0                 2.2880000000000003  1.8                 1.8
6                   6.6856              2.0                 2.3904              1.8                 3.6
7                   6.5084800000000005  2.0                 2.47232             1.8                 5.4
8                   6.306784            2.0                 2.5378559999999997  1.8                 7.2
9                   6.0854272           2.0                 2.5902847999999996  1.8                 9.0
10                  5.848341759999999   2.0                 2.6322278399999997  1.8                 10.8
```

With rounding:

```
$ cat pipeline.sys | systems-run --round-to 2 | cut -f1,14- | expand --tabs=14
              Options       Initiatives   Deliverables  Observables   Done
0             0             0             0             0             0
1             5             0             0             0             0
2             6             2             0             0             0
3             6             2             2             0             0
4             5.94          2.0           2.16          1.8           0
5             6.83          2.0           2.29          1.8           1.8
6             6.69          2.0           2.39          1.8           3.6
7             6.51          2.0           2.47          1.8           5.4
8             6.31          2.0           2.54          1.8           7.2
9             6.09          2.0           2.59          1.8           9.0
10            5.85          2.0           2.63          1.8           10.8
```
    @benbc
    benbc committed Aug 5, 2022
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  2. Include help output in README

    @benbc
    benbc committed Aug 5, 2022
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