equivalents for alloc_pkb() and free_pkb(), which will be retired in
due course).

from the normal POSIX-style open()

ensure that we only drop our self-reference exactly once.

To maintain the guarantee that an object won't go out of scope
unexpectedly while one of its event handlers is being called, the
event-calling functions now automatically obtain and drop extra
references.

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

in code defining reference-counted objects.

Dehyphenate "data-transfer".

output buffering defintions and the like)

Added basic El Torito ISO image boot capability

download

Make expand_buffer() a non-inline function, so that we can add debug
messages.

Expandable buffers now don't *always* round up to the next power of two.
This allows e.g. loading a 137MB ISO image on a machine with only 256MB
RAM...

around which still hold pointers to variables belonging to our parent...

correct prototypes for srandom(), rand() and srand().

is now gPXE-specific.  (The standard malloc() et al have been in stdlib.h
for a while).

Add free memory counter.

full-length PKB allocation.

protocols by URI scheme.

reflect the fact that they allocate and deallocate user memory (i.e.
things reached through a userptr_t).

will enable us to cascade async operations, which is necessary in order to
properly support DNS.  (For example, an HTTP request may have to redirect
to a new location and will have to perform a new DNS lookup, so we can't
just rely on doing the name lookup at the time of parsing the initial
URL).

Anything other than HTTP is probably broken right now; I'll fix the others
up asap.

handle something as convoluted as

  ftp://joe:secret@insecure.org:8081/hidden/path/to?what=is#this

This bug found by setting read and write watchpoints at NULL in bochs.