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Check buffer lengths in stream filtering functions before access (#275)

* Check buffer lengths in stream filtering functions before access

A number of exported functions in stream_filt.jl have @inbounds access to
buffers without verifying their lengths. This can cause segfaults, as seen in
issue #262.

* Fix buffer length checking

I can't figure out the buffer length requirement for one function, and removed
the `@inbounds` macro until I can.

* Update src/Filters/stream_filt.jl

Co-Authored-By: galenlynch <glynch@mit.edu>

* Update src/Filters/stream_filt.jl

Co-Authored-By: galenlynch <glynch@mit.edu>

* Fix estimation of buffer length required

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