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GiggleLiu 
WIP Exp space  (#10)

* Implement exponential-space einsum

Implementation based on broadcasting * and summing over contracted 
dimensions. Can't take traces or diagonals but allows contractions and 
star-contractions.

* Remove isnothing since it's not in 1.0

* Add test for permutation

* Sum over all indices that don't appear in output

This way we can also take column sums.

* Return 0-size result before attempting permutation

* Add and clean up tests

* Move einsum into its own file

* Add inplace version of einsum

* Add type signatures to catch errors early

* Modify return to ensure out is returned and updated

* Draft a benchmark-file

Benchmarks everything from the possible features with naive julia 
implementations. Just to set the structure that all 
branches/implementations should use to compare performance. While 
comparison between commits/branches should be easy, within is less 
trivial - e.g. comparing "Float64" with "Float32" across all operations 
doesn't work by judge-ing SUITE[@tagged ...].

* Fix diag-function in benchmark

* Fix batchmultiplication function

* Fix benchmarks

Assign each function a unique name to avoid calling the wrong function 
with foo (as before) s.t. the whole thing runs smoothly.

* Ignore .json files

* Add larger input to mydiag

* Remove ampersand from benchmark-name to avoid special chars

* Move code to preallocate output-tensor in its own function

* Implement diag/trace/ptrace via diag & lone-index reduction

* Remove isnothing for 1.0 compatibility

* Load package in benchmarks

* Remove dependency duplicate

* Implement backwards of diagonals/traces etc. with expandall!

* Fix general expanding einsums

* Allow Non-Integer labels (e.g. chars)

* Loosen restriction on input-array to AbstractArray

* Remove unused argument from diagonal(s)

* Add docstrings

* Minor style-changes

* Split tests into files for each testest

79 of 82 relevant lines covered (96.34%)

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Source Files on job 49.1