As requested in issue #32. I hadn’t added it previously, due to the description attached to it: “Stick with normal! It's been carefully tested. Setting this option to high or low does use the same Solarized palette but simply shifts some values up or down in order to expand or compress the tonal range displayed.”
Implemented the 16-color mode for emacs in terminal mode, just as the
vim colorscheme does: with the same default and the same configuration
variable.
Updated the README accordingly.