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.

do it.

Add IMAGE_PXE to use the new image format framework.  "kernel pxelinux.0"
now works.

that switches from line-oriented to byte-oriented partway through, such as
HTTP.

took out the contract to eventually call efree() when it called fetch().

Maintain the most recently loaded image at the start of the list, so that
imgautoselect() will pick it.

Add scripts as an image format (since it's trivial to do).

Avoid returning errors for comments and empty lines.

returns the allocated buffer.

refer to them by name from the command line, or build them into a
multiboot module list.

Use setting image->type to disambiguate between "not my image" and "bad
image"; this avoids relying on specific values of the error code.