Let a cursor stay before text inserted at it (a mark)

Text inserted at a cursor's position pushed every cursor there behind
it. That suits a caret, not a remembered position: a mark, a selection's
start or a bookmark should stay before the new text. A cursor state's
reserved word in the module now carries a flag: 1 makes it a mark, which
stays where text is inserted at it and otherwise follows edits as any
cursor does. The flag is refused on other states and other values;
existing modules, with 0 there, keep their meaning.

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