[WIP/DNM]make similar produce the right chunktype

[vchuravy]

Defaulting to Array breaks a mat * vec of DArray{CuArray}

[raminammour]

Could you please fix similar to give the right distribution while you are at it :)

This doesn't work:

julia> dd=drand((10,10),workers(),[2,1]);

julia> ds=similar(dd);

julia> ds.indices
1x2 Array{Tuple{UnitRange{Int64},UnitRange{Int64}},2}:
 (1:10, 1:5)  (1:10, 6:10)

julia> dd.indices
2x1 Array{Tuple{UnitRange{Int64},UnitRange{Int64}},2}:
 (1:5, 1:10)
 (6:10, 1:10)

Which breaks copy, and may other constructs.

Thank you!

[vchuravy]

This has become a pile of various changes I needed for a project, I will separate them out as well as cleaning them up.

[ViralBShah]

Closing because its old.

[vchuravy]

Not that old :) and I would keep it open as a reminder to myself that this work needs to get cleaned up and finished or migrated over to Dagger.