[Nexus] Correct way to specify multiple signals

[V. Armando Solé]

I think it is clear there is a need and I have opened an issue at github:

https://github.com/nexusformat/NIAC/issues/25

The text follows.

*Typical use cases:*

  * Plotting several counters at scanned positions.
  * Fitting raw data and willing to generate a plot with the raw data
    and the fitted data
  * Elemental mapping where a map is generated for each element
    ....

The combination of multiple signals with the use of NXprocess would
solve many provenance issues.

*Proposed Implementation*

In the past, everything was ready for the implementation via allowing to
have multiple datasets with the signal attribute in an NXdata group and
by playing with attribute values "1", "2", "3". That approach is not any
longer possible.

  * Proposal 1: Allow signal to be an array of string with the first
    element of the array to be treated as it is now the case with single
    signals.
  * Proposal 2: Define a signals attribute being an array of strings
    with the first element of the array to be treated as it is now the
    case with single signals.
  * Proposal 3: Define a new set of groups NXplot1d, NXplot2d, NXplot3d,
    ... allowing so.

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