Rename/make uniform the other query entities

Following the new naming style introduced in Exports.hs, this patch
renames the other resources to export non-qualified names (fieldMap as
opposed to nodeFieldMap), and to use qualified module imports.

Also fixes a haddock issue in a docstring.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>