rename STRING_SET_CHARS to STRING_SET_SIZE (was: libnettle/libhogweed WIP)

[Ted Zlatanov]

On Sat, 15 Apr 2017 22:39:57 -0400 Ted Zlatanov <address@hidden> wrote: 

TZ> On Sat, 15 Apr 2017 17:55:00 +0300 Eli Zaretskii <address@hidden> wrote: 

EZ> I think STRING_SET_CHARS is what you want here.

TZ> Thank you for letting me know. That macro has a terrible name and should
TZ> probably be called STRING_SET_{SIZE,LENGTH} or similar. But yeah, it
TZ> seems right.

Eli, anyone else, is it OK to do that renaming of STRING_SET_CHARS to
STRING_SET_SIZE? It's a small thing but annoys me :)

Ted