Differences between glyphs in release-6.7 and release-7.2.0

Uniformisation of signs shapes.

I had kept a number of signs I liked from old versions of JSesh. In a number of cases (for instance C2), I found they made better font signs, as they had fewer details. But they didn't match the style of the rest of the font, which created a weird impression. Hence, I have decided to use M. Thomas latest versions of those signs in each case.

Code release-6.7 release-7.2.0
C10
C10A
C17
C2
C232 n/a
C2A
C303
C39
I96
I96VARA
K13
N7
S68A n/a
Z2D n/a