Fixed several errors involving single quotes, parentheses and <add> e…

…lements.

Each difference in this commit can be traced back to the following logical pages
in the PDF version (https://archive.org/details/mantoninusimpera00marcuoft):

14, 19, -, 24, 25, 28, 35, 38, 39, 42, 46, 55, 64, 64, 65, 69, 70, 80, 86, 91,
95, 105, 108, 110, 113, 121.