Changed the iteration failsafe limit for ensureValidHierarchy() from 20 to 100, to cater for documents with really deeply nested lists/tables.
Changed the iteration failsafe limit for ensureValidHierarchy() from 20 to 100, to cater
for documents with really deeply nested lists/tables.

corinthia/corinthia-editor,corinthia/corinthia-editorlib,corinthia/corinthia-editor,corinthia/corinthia-editorlib,corinthia/corinthia-editor,corinthia/corinthia-editorlib,corinthia/corinthia-editorlib,corinthia/corinthia-editor,corinthia/corinthia-editorlib,corinthia/corinthia-editor