Starting the infrastructure for writing files.#322

Merged

jpivarski merged 12 commits intomainfrom jpivarski/writablefile-infrastructure

Apr 8, 2021

+1,862-4

Commits on Apr 2, 2021

Commits on Apr 3, 2021

New thought: cascading serializations.
jpivarski
committed

Commits on Apr 5, 2021

Check in partial work on cascading.
jpivarski
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Commits on Apr 6, 2021

Cascading correctly makes an empty file.
jpivarski
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Subdirectories are different from the root directory.
jpivarski
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Confirmed: objects can grow into blank allocations, as long as the allocation is included in TKey::fNbytes. If ROOT resizes them, it shrink-wraps and gets the FreeSegments right. Also confirmed: fL…
jpivarski
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