Returns the {@link IniSection} with the given name or {@code null} if no section with that name exists.
@param sectionName the name of the section to retrieve.
@return the {@link IniSection} with the given name or {@code null} if no section with that name exists.
Returns the {@link IniSection} with the given name or {@code null} if no section with that name exists.
@param sectionName the name of the section to retrieve. @return the {@link IniSection} with the given name or {@code null} if no section with that name exists.