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This reverts commit ecf4e39e.

This adds the directory `src/lib` to the public header search path for NekRS.  Without it, CMake projects that included NekRS weren't able to link to libnekrs correctly.

* Realloc buffers as required for reductions in linAlg_t
* Bug fix for linAlg_t::max/min kernels
* Add ciTest for linAlg_t reductions to ensure correctness
* Remove accidental change to makenrs

* Use git subtree instead of downloading 3rd-party deps

* Add early prepostRecv option
* Enable FDM overlap by default
* fix accuracy issue when printing device memory usage
* fuse pack/unpack of halos + comm buf
* initialize gs->mode properly
* abort in build-only mode if udf failed to compile
* use correct diffusivity in k-tau example
* set correct default initial guess method for scalars
* do no duplicate device memory for CPU backend
* bypass unnecessary parAlmond setup steps
* add missing mcmodel in CFLAGS

git-subtree-dir: 3rd_party/nek5000_gslib
git-subtree-split: 88f90cb96953527e3e833f8dbf2719273fc8346d

git-subtree-dir: 3rd_party/nek5000_parRSB
git-subtree-split: bd871e85fd4ef66142a7c99f7647a6cf8810cd89

002ed028 do not use tarball if source dir exists for parRSB + gslib

git-subtree-dir: 3rd_party/nek5000
git-subtree-split: 002ed028

git-subtree-dir: 3rd_party/occa
git-subtree-split: ef7be8425e2460b1e07160b7a7e4dab41ccd510c

git-subtree-dir: 3rd_party/nek5000
git-subtree-split: 221fa825

git-subtree-dir: 3rd_party/hypre
git-subtree-split: 1b687efdc97223abc23c192051c4a7de2ac4cd51

- abort in build-only mode if udf failed to compile
- use correct diffusivity in k-tau example
- default initial guess method for scalars

Cardinal update 1 20

See merge request !3