Pull in useful bits from NetBSD and make our lp* easier to diff and

do some minor cleanup of my own:

o IPv6 support
o ANSI function headers
o use getopt()
o synce usage() with man pages
o passes -Wall on both 32bit and 64bit platforms
o add an option to set the max number of children lpd will fork off
o add an lpd option to bind to specific addresses instead of INADDR_ANY.
o allow user to specify how long to wait for a connection to remote servers
o more strlcpy() and snprintf() usage
o Use FOO_FILENO constants instead of hard-coding 0-2
o Add some keeps to man the page SYNOPSIS to avoid options being split

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