directories and move code into proper modules.
For similar historical reasons, the include path also includes
-`src/gromacs/legacyheaders/` and `src/gromacs/gmxpreprocess/` (the latter only
-for part of the source). New code should not depend on these.
+`src/gromacs/legacyheaders/`. It is preferred that new code does not depend on
+this.
Documentation organization
==========================