Make ChunkSizeInto behave according to documentation with regards to the key for `Boundary.AtBeginning`  is the last key. This is needed for overlapped windows build by ChunkSizeInto with size X and then by moving window on the chunks with widths Y and merging chunks inside each window. The result is overlapped windows with widths `X*Y` and step `X`. With current behavior, the key for each overlapped window is the first key of the last inner chunk, i.e. `__._` not `___.` if we have 3 inner chunks.
Make ChunkSizeInto behave according to documentation with regards to the key for `Boundary.AtBeginning`  is the last key. This is needed for overlapped windows build by ChunkSizeInto with size X and then by moving window on the chunks with widths Y and merging chunks inside each window. The result is overlapped windows with widths `X*Y` and step `X`. With current behavior, the key for each overlapped window is the first key of the last inner chunk, i.e. `__._` not `___.` if we have 3 inner chunks.

tpetricek/Deedle,Dependencies/Deedle,buybackoff/Deedle,tpetricek/Deedle,caioproiete/Deedle,BlueMountainCapital/Deedle,Dependencies/Deedle,tpetricek/Deedle,buybackoff/Deedle,AtwooTM/Deedle,buybackoff/Deedle,Dependencies/Deedle,AtwooTM/Deedle,caioproiete/Deedle,BlueMountainCapital/Deedle,caioproiete/Deedle,AtwooTM/Deedle,BlueMountainCapital/Deedle