Style iostream option

• Minor adjustments to the internal layout and management of IOstream options (format, compression, version) with a change in the underlying enum type from int to char. Shaves off a few bytes for each stream.

• Bundling the stream options might also be useful in the future to pass around as an opaque structure IOstreamOption, but haven't fully explored how much benefit this would bring.

changed the description

marked as a Work In Progress

added 6 commits

• c11dd504...4a16d589 - 5 commits from branch develop
• 76bff944 - STYLE: reorder/refactor stream format options

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added 12 commits

• 76bff944...19e664f8 - 10 commits from branch develop
• 3897ea75 - STYLE: reorder/refactor stream format options
• 1d7ca8b3 - STYLE: relocate stream allocators to Detail namespace

Compare with previous version

unmarked as a Work In Progress

merged

mentioned in commit 62bd8454