Tom Wright

Add `MOInputHeterotopic` type & helpers

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**Summary** This closes #358 which proposes making a `MOInputsHeterotopic` type and some supporting infrastructure. It is meant for multi-ouput GPs where not all data is observed at every output.

Things to change before making a breaking release

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1) Renaming of multi-output related items, see https://github.com/JuliaGaussianProcesses/KernelFunctions.jl/issues/328 and https://github.com/JuliaGaussianProcesses/KernelFunctions.jl/issues/332 2) Change the multi output input type definitions to not have abstract types as fields. Change to something like: ```...

Might we want something similar to `MOInputIsotopicByFeatures` and `MOInputIsotopicByOutputs` for heterotopic data? I think this would be a good idea since we could then define some convenient helper functionality to...

Revisit Multi-Output Support Naming Conventions

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Two new multi-output input types are being added and the [PR](https://github.com/JuliaGaussianProcesses/KernelFunctions.jl/pull/310) sparked some debate/discussion surrounding their names and the wider spread naming conventions that have been adopted in `KernelFuntions`. The...

Addition of generic / introductory glossary

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Closes #117 Please let me know where I missed the mark / could use some review!

Add simple functionality for filling diagonal with the same matrix

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Maybe this is unnecessary, or maybe there is an easy way to do this already, but could it be beneficial to add functionality like this? ``` julia> x = rand(2,2)...