Document ad hoc import and its usage in glue buildfiles

If the target being imported has no project name and is either absolute or is
a relative directory, then this is treated as ad hoc importation. Semantically
it is similar to a normal import but with the location of the project being
imported hard-coded into the buildfile.

This type of import can be used to create a special "glue buildfile" that
"pulls" together several projects, usually for convenience of development. One
typical case that calls for such a glue buildfile is a multi-package project.
To be able to invoke the build system driver directly in the project root, we
can add a glue buildfile that imports and builds all the packages:

import pkgs = */
./: $pkgs

See "Target Importation" in the manual for details.

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