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V0.9.0  (#22)

# v0.9.0 #

The changes made in this PR is aimed at better supporting v0.9.0 of Gorgonia itself.  Along the way there are some new features and optimizations, as well as some bug fixes. 

The majority of the work in supporting v0.9.0 of Gorgonia is to shore up the underlying architecture to support CUDA related engines. This means moving more things to rely on `Engine` while keeping the engine interface overheads low.  Additionally this also means better support for column major data layouts. 


* Heavier reliance on `Engine` for most functions. This allows for extensibility on the data structure.
* Long standing bugbear - concepts of `RowVec` and `ColVec` has been removed (thanks to @matdodgson)
    - Touch points: `ap.go`, `iterator.go`,  `iterator_mult.go`.`shape.go`, and the tests that were correct prior to this change have semantic meaning changes too. 
    - **POTENTIAL TECH DEBT**: `iterator_mult.go` - the solution of filling with ones is a little too dodgy for my liking. The alternative would be to change `BroadcastStrides` which will change even more things (`Concat`, `Stack` etc)
* **Optimization**:
    -  `AP` has been depointerized in `*Dense` (thanks to @docmerlin). This reduces *some* amount of GC pointer chasing, but not all
    - allocation is slightly improved. (`(array).fromSliceOrArrayer`, `(array).fix()` and `(array).forcefix()` are part of the improvement around the logic of allocating data.
* **Bug fixes**:
    - Fixes subtle errors in linear algebra functions. The result is a slightly longer function but easier to reason with.
    - Fixes some subtle bugs in `Concat` - see also gorgonia/gorgonia#218
    - Fixed some small bugs with regards to `SampleIndex` that only show up when the slices have extreme lengths. This API should have been deprecated 2 years ago, but eh... it touched a lot of external projects.
* **API changes**:
    - `Diag` is made available. Relies heavily on an `Engine`'s imple... (continued)

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1 139.1 0
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2 139.2 0
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3 139.3 0
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