from_line_marker: allow negative relative line numbers

feat: Parent chain matching - Add support for dot notation in identif…

…ier names to specify parent relationships

Initial support for keyword 'METHOD'

Fix off-by-one bug in InsertClause handling; Add test case

Add exception checking to test_corpus.py;

Fix bug in 'restrict_search_range'

Fix bugs

Fixed big

Fix significant bugs

CEDARScriptEditorException: improved prompting in error message

CEDARScriptEditorException: Better message formatting