I wanted to get this section started so that I can easily add to it when I
have small bits of time to do so. Our documentation needs to improve.
* doc/Makefile.am (tame_TEXINFOS): Add `concept.texi'.
* doc/concept.texi: New file.
* doc/preproc.texi: Remove accidentally added input line.
* doc/tame.texi (menu): Add `Core Concepts' node.