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Lossy float compression configuration updates

Alaettin Serhan Mete requested to merge amete/athena:master-float-compression-mantissa-configuration into master

As discussed in the OAB meeting on 13/01/2020, this MR extends the lossy float compression support in the I/O layer. It's now possible to configure two settings as high and low. It's further possible to configure the mantissa bits independently via AthenaOutputStream. By default high-compression uses 7 mantissa bits while low compression uses 15 mantissa bits. However, float compression is off by default.

cc @gemmeren @mnowak @jcatmore

PS : Main JIRA ticket for future reference ATEAM-587

Edited by Alaettin Serhan Mete

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