No longer allows symbols of size less than 2mm high or 2mm wide
Enforces correct sizing for Australia Post, Intelligent Mail, Royal Mail 4-State and KIX Code
Adjusts ascender/tracker/descender proportions on all 4-state codes to revised 3/2/3 standards
Enforces normative sizing for UPC and EAN
Enforces minimum sizing for Codabar and Code 49
Tidies up the code a bit so that all of the above makes some sense
Made corrections to the rendering of UPC and EAN symbols in render.c
including taking account of EAN-2 and EAN-5 addon codes, correct text sizing
and simplified guard bar extension.
Correction makes the height and width adjustment in render.c work as expected.
Height and width of a symbol can now be manipulated to any value in gLabels
with Zint adding padding or changing height of the symbol as required.
