Relicense files for which I am the sole author (as identified by
util/relicense.pl).

Signed-off-by: Michael Brown <mcb30@ipxe.org>

Remove name-resolution as an interface type, and replace
name-resolution interfaces with generic interfaces supporting the
resolv_done() method.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

We have several types of object interface at present (data-xfer, job
control, name resolution), and there is some duplication of
functionality between them.  For example, job_done(), job_kill() and
xfer_close() are almost isomorphic to each other.

This updated version of the object interface mechanism allows for each
interface to export an arbitrary list of supported operations.
Advantages include:

  Operations methods now receive a pointer to the object, rather than
  a pointer to the interface.  This allows an object to, for example,
  implement a single close() method that can handle close() operations
  from any of its exposed interfaces.

  The close() operation is implemented as a generic operation (rather
  than having specific variants for data-xfer, job control, etc.).
  This will allow functions such as monojob_wait() to be used to wait
  for e.g.  a name resolution to complete.

  The amount of boilerplate code required in objects is reduced, not
  least because it is no longer necessary to include per-interface
  methods that simply use container_of() to derive a pointer to the
  object and then tail-call to a common per-object method.

  The cost of adding new operations is reduced; adding a new data-xfer
  operation such as stat() no longer incurs the penalty of adding a
  .stat member to the operations table of all existing data-xfer
  interfaces.

The data-xfer, job control and name resolution interfaces have not yet
been updated to use the new interface mechanism, but the code will
still compile and run.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

Access to the gpxe.org and etherboot.org domains and associated
resources has been revoked by the registrant of the domain.  Work
around this problem by renaming project from gPXE to iPXE, and
updating URLs to match.

Also update README, LOG and COPYRIGHTS to remove obsolete information.

Signed-off-by: Michael Brown <mcb30@ipxe.org>

Add FILE_LICENCE declarations to almost all files that make up the
various standard builds of gPXE.

Eliminate the potential for mismatches between table names and the
table entry data type by incorporating the data type into the
definition of the table, rather than specifying it explicitly in each
table accessor method.

Intel's C compiler (icc) chokes on the zero-length arrays that we
currently use as part of the mechanism for accessing linker table
entries.  Abstract away the zero-length arrays, to make a port to icc
easier.

Introduce macros such as for_each_table_entry() to simplify the common
case of iterating over all entries in a linker table.

Represent table names as #defined string constants rather than
unquoted literals; this avoids visual confusion between table names
and C variable or type names, and also allows us to force a
compilation error in the event of incorrect table names.

Conventional usage of the various struct sockaddr_xxx types involves
liberal use of casting, which tends to trigger strict-aliasing
warnings from gcc.  Avoid these now and in future by marking all the
relevant types with __attribute__((may_alias)).