Add "xfer" to all xfer functions and "job" to all job functions.

the most generally useful way.

in code defining reference-counted objects.

Dehyphenate "data-transfer".

functions.

output buffering defintions and the like)

connections might break things. Only-sending applications like syslog()
do not need a newdata() handler, so added a check if that handler exists.

Generate DHCP data block for images.

block, so first32.c dies immediately.

image file.

ISA 3c509 is currently non-functional, although the EISA (3c509-eisa) and
MCA (3c529) variants should build OK.

None of this code is yet tested.