* module/ice-9/annotate.scm (deannotate/source-properties): Version of
deannotate that sets source properties on the resulting expressions.
* module/ice-9/syncase.scm (sc-macro, syncase): Annotate expressions
before they go into syncase, and deannotate/source-properties when they
come out. The upshot is that syncase now understands source
information, yay!
* module/ice-9/annotate.scm (<annotation>): Slightly more concise
printing.
(annotate): Don't create annotations if we have no source info.
* module/ice-9/psyntax.scm (annotation?): Remove this definition, as we
now provide annotation support.
* module/ice-9/psyntax-pp.scm: Regenerated.
* module/ice-9/syncase.scm: Use (ice-9 annotate).
* module/language/scheme/expand.scm (eval-when): Define the eval-when
transformer.
* module/language/scheme/expand.scm: New module, implements a separate
expansion phase, not interleaved with compilation.
* module/language/scheme/amatch.scm: Helper for expand.scm, it's pmatch
with support for annotated source.
* module/ice-9/Makefile.am (SOURCES): Add annotate.scm to build list --
early on because it will be used in the compiler.
* module/ice-9/annotate.scm: Fix the printer, default to unstripped
(whatever that is), and add a deannotator.
* module/system/base/compile.scm (call-with-compile-error-catch): Fix for
new representation of source locations.
* module/Makefile.am (SCHEME_LANG_SOURCES): Add amatch and expand.
