Handle cyclic w references#169
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Track the num IDs visited during a single find_level lookup and return None when a num ID repeats, so a cyclic w:numStyleLink chain is treated as having no resolvable level instead of recursing without bound. Adds a regression test covering a two-entry cycle.
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Numbering.find_level resolves w:numStyleLink by following the referenced numbering style to another w:num. If those references form a cycle, the lookup currently recurses until Python raises RecursionError.
This change tracks num IDs visited during a single lookup and returns None when a num ID is seen twice. A cyclic chain is therefore treated as having no resolvable level.
No behaviour change for valid documents; existing numbering tests pass unchanged.
Adds one regression test covering a two-entry w:numStyleLink cycle.