To import a distribution of ncbi, we do the following:

* Configure ncbi as normal with:
./configure --without-boost --without-debug --with-symbols

* Compile ncbi

* Save all generated .cpp and .hpp files; wipe the rest of the files
built with the ncbi build system

* cp src/app/blast/blast_app_util.hpp include/.  (spiral's gbwt/blast
includes this file)

* Add minimal makefiles in "seqloc" and "seqfeat", since they're
  missing and I don't undertand how it figures out which source files
  to include.

* Run ./spiral_generate_build.pl to generate bazel BUILD files

* Run buildifier -v on all generated BUILD Files to make them pretty

(Note by nils: I ran into a problem with an ambiguous "isnan" in some
files.  I fixed it by changing "isnan" to "::isnan".  Hopefully this
problem should go away in later versions of something.)