v3.3.4 Various formatting additions

• Add affiliation sep so can have affiliations on new line
• Add author-space-between so can have each author-address block separated by space
• Allow author, affiliation, header, footer, date to have color
• Add date to coverpage
• Add -node-spec for coverpage elements so you get full control over the nodes and can make the text boxes filled with color.
• Add some info to the documentation on how to define your own color in the LaTeX header