DOC: fix some typos etc.
txt2html: support `code` and -listitem
rebuild iso when root/ changed

also touch root on site
shell: 'play': fix error message

move label so orig filename is backed up always.
minor improvements; check oversized TCP packets

kernel/net/tcp.s:
	check for oversized packets and RST if so.

kernel/fs/fs_oofs.s:
	improve clarity of error message;

kernel/kapi/kapi_page_int.s:
	add note on how to have 4 billion apis rather than 4k;

kernel/net/cloudnet.s:
	disable rebooting via network;

kernel/net/socket.s:
	optimize a print;
fs.s: remove debug listing /dev
fix triplefault on kvm
cloudnet: exit task if cluster load fails
fs_oofs mkfs: save volume descriptor
util/stabs.pl: add --base; add usage
format kernel.link
Add DOC/SourceOrganisation: source tree layout