José Matos ea8b0df0e4 Add new semantic functions to add an remove document options.
The objective is to identify common operations and place them
in functions in order to improve the readability and correctness of the code.

is_document_option(document, option):
  Find if _option_ is a document option (\\options in the header).

insert_document_option(document, option):
  Insert _option_ as a document option.

remove_document_option(document, option):
  Remove _option_ as a document option.
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