Add feature to humanize function for floats: round them.

[jasikpark]

Currently I'm using printf for displaying my image metadata,

{{ with $src.Exif }}
  <ul>
      {{ with .Tags.ApertureValue }}<li>Aperture: {{ (printf "%.2f" .) }}</li>{{ end }}
      {{ with .Tags.BrightnessValue }}<li>Brightness: {{ (printf "%.2f" .) }}</li>{{ end }}
  </ul>
   {{ end }}

{{ with $src.Exif }}
  <ul>
      {{ with .Tags.ApertureValue }}<li>Aperture: {{ (humanize .) }}</li>{{ end }}
      {{ with .Tags.BrightnessValue }}<li>Brightness: {{ (humanize .) }}</li>{{ end }}
  </ul>
   {{ end }}

[Jos512]

I can see that rounding floats might be a way to 'humanize' text, especially when the value is something like 1.00000000001. And perhaps two decimal digits are a good way to 'standardise' values.

But what about the decimal point? Some countries use a dot, others a comma (overview of those countries). So while 12.34 might be a humanised version of 12.343231 for person A, it might be wrong for person B.

Luckily we already have the lang.NumFmt function for those use cases. And in other cases the math.Round function works well.

[jasikpark]

Ok, cool -- I could not find lang.NumFmt for my life -- maybe something in the documentation adding some keywords about formatting floats could be added so it shows up in search?

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