Add a tag to a table. The created tag should be in the table (ObjGtkTextTableTag object) for a given textbuffer (ObjGtkTextBuffer) before using them with that textbuffer.
Ajoute un tag à une table existante.
_table_ : ObjGtkTextTableTag : a table of tags.
_name_ : S : a name for the new tag (this name should be a really new and human comprehensive name)
_list_ : [[S S] r1] : a list of parameters. See properties page before set to this list.
Return : ObjGtkTextTableTag : the same table of tags or nil if error (e.g. the table is unknown, the name of the tag already exists, ...).
See also : _gtkTextTableTagAdd.