This procedure is used to render the page footer. It is automatically called by AddPage and
Close and should not be called directly by the application. The implementation in TclFPDF is
empty, so you have to override the procedure if you want a specific processing.
Example
proc Footer {} {
# Go to 1.5 cm from bottom
SetY -15;
# Select Arial italic 8
SetFont Arial I 8;
# Print centered page number
Cell 0 10 "Page [PageNo]" 0 0 C;
}