(PhGraphicStrip) Only draw the people names if they are visible

This ultimately reduces the number of OpenGL calls quite a lot,
which is a good thing (unvisible drawings seem to slow down the
rendering a lot on Intel HD Graphics cards)
(PhGraphicStrip) Only draw the future people names if they are visible

This ultimately reduces the number of OpenGL calls quite a lot,
which is a good thing (unvisible drawings seem to slow down the
rendering a lot on Intel HD Graphics cards)
Merge pull request #221 from tlecomte/tlNextTCFix

Tl next tc fix