Implement a pipeline system for compression

[xiaodaigh]

Thinking about JDF it can actually be thought of as a pipeline

raw data -> blosc compressed/rle compressed -> written

Conceivably, we can have more elaborate pipelines like

raw data -> rle compress -> blosc compress-> written

and before we start, we do not know which compression is better e.g.

raw string data -> string array -> blosc compress -> written
or
raw string data -> rle compress -> blosc compress -> written

so we can have this comparison pipeline concept. So we can compare both compress before writing to disk, but all we have to do is to remember the operations in a pipeline and and then retry them.