While here pad line numbers with spaces instead of zeroes to match the blob view.

positive feedback from Kyle Ackerman ok/tweak tracey@

while here clean up some *_header id not used / not needed.

ok tracey@

proc.c really shines when there's a network of different types of processes, potentially with a various number of instances each, that needs to exchange messages. Gotwebd instead has a much simpler design, and using proc.c causes more overhead (/headaches) than it solves. So, this attempts to provide the same functionalities but with a much simpler implementation that fits gotwebd better. ok stsp@

fixes an unused variable that should have been dropped in previous commit too. ok stsp@