* doc/ref/api-evaluation.texi: Add documentation for the standard
compilation interface, and some notes about compiled files.
* doc/ref/api-procedures.texi (Compiled Procedures): A stub at
documenting compiled procedures.
* doc/ref/compiler.texi (Compiling to the Virtual Machine): Flesh out
with some structure, though much of the text remains to be written.
This stuff is hard to write!
* doc/ref/compiler.texi: A new empty section on the compiler.
* doc/ref/data-rep.texi: Made to be a section of a chapter instead of an
appendix. The beginnings of some revision, but not there yet.
* doc/ref/guile.texi: Put the "Data Representation" essay into the new
"History and Implementation Details" chapter.
* doc/ref/history.texi: New empty section on Guile history.
* doc/ref/libguile-concepts.texi:
* doc/ref/libguile-smobs.texi: Fix up some xrefs.
* doc/ref/vm.texi: New section documenting the VM. Not done yet.
