When loading an unknown system, revert to text mode first.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Add 'isolinux=' option to chain.c32 for chain-loading
another isolinux.bin.

Impact: Error message is more detailed

In case of syntax error, the message is far more detailed and provides
the same content as the documentation integrated in the source code.

Impact: visual

Some \n where missing in some error() calls

Signed-off-by: Gert Hulselmans <kimmik999999@yahoo.co.uk>

Conflicts:
	com32/modules/chain.c

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

When loaded from ISOLINUX, we still have a valid boot drive.  Set it!
This permits the use of chainloaded boot loaders.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Automatically reformat com32/modules/chain.c using Nindent.

Do this for all files except HDT, gPXE and externally maintained
libraries (zlib, tinyjpeg, libpng).

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Remove a clobber of drivename and partition, after we have spent time
computing what the should have been...

Reported-by: Luciano Miguel Ferreira Rocha <strange@nsk.no-ip.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Update copyright notices; add Intel copyright notices where appropriate.