Resolve "Fix Problem::getState() and getState(ts)"

Closes #342 (closed)

added Doing bug labels

added 3 commits

• 050558b1 - Fis offending casse with an assert
• bc36f05e - Remove size() from the API
• 7a7f1c46 - Add missing state blocks filled with zeros

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unmarked as a Work In Progress

merged

mentioned in commit a26e7dcc