`size_t` as appropriate)
- BMP: lessen heap memory usage by only `malloc()`ing a row, not
whole file
- GIF: lessen heap memory usage by paging (also simplifies some
function returns); use standard colour char map
- raster: add `raster_malloc()` to fail > 1GB (avoids very large
output files that most systems can't handle; also lessens to
some degree chances of being victim of OOM killer on Linux)
- GUI: printing scale dialog: set maxima on X-dim and resolution
to keep scale <= 200
vertical whitespace, as they're decorative rather than functional (#247)
Allow for dot overspill in height of vertical box sides (dotty mode)
Move is_dotty(), is_fixed_ratio() from library.c to common.c
bmp/emf/ps.c: allow for foreground colour in ULTRA
bmp/gif/pcx.c: allow for BARCODE_STDOUT (fflush/fclose)
emf.c: hexagon rotation field not used; dont't use float index in font loop; Windows stdout binary mode
png.c: remove unused 8-bit; simplify libpng error handling and fclose outfile on error
ps.c: fix buffer overflow on colour_to_pscolor() CMYK
tif.c: fix BLACKISZERO indexes
CODE39: simplify check digit setting
reedsol.c: rs_uint_init_gf() log/alog tables must be zeroed
ZBarcode_Encode: debug: fix access out-of-bounds on non-NUL-terminated source if length < 10
manual.txt/zint.h: document NUL-terminated strings
tests: cover further cases for output (bmp/emf/etc), eci/gb18030/gb2312/sjis, reedsol, AZTEC, CODE39
