- Trying to reduce the number of top-level files in Spack.

- CODE_OF_CONDUCT.md can be referenced from the README.

- CONTRIBUTING.md is only used to display a message on pull requests, and
  it still does that when in .github.

The version of LLVM used by flang is new enough that CppBackend doesn't exist.  Unfortunately, `flang-xxxxxxxx` is seen as < `3.9.0` by the version check.  

* add a special case for `flang` versions.

The PR for shared libraries has been merged upstream -> add new version.

- We've seen this a few times now where users have set up `cd` to echo
  the new directory, and it screws up `setup-env.sh`

- In the past we've said this is user error.

- Here, we just fix it by sending `cd` output to /dev/null where needed.
  - this works in bash, zsh, and dash

Remove package access from directory_layout; add regression test to ensure
that specs can be uninstalled without a package being known

Add an example of a 'modules:' entry for an external package in
packages.yaml.  The 'External Packages' section of 'Build
Customization' mentions 'paths:' and 'modules:' and gives an
example of paths, but not modules.

The old version was no longer available for download

This configure option is not supported on ARM

Setting name within the package class allows overriding the package
name, which both packages do using several for loops.

Fixes #11789

* portage: add v1.2.2

* Update package.py

* Update package.py

* Update package.py

* Update package.py

* flake8

Apply patch to current version which has not yet been merged in the
upstream package repo.

* Add Chill package
* Add IEGenLib package, a dependency of Chill

* f90cache: change the download url

* f90cache: added the download url for ver 0.99

* tcsh: change the download url, add version 6.21.00

* tcsh: change the download url

* tcsh: Fix checksum for 6.20.00

* OpenFOAM: rationalize architecture options

- older versions of OpenFOAM had WM_ARCH_OPTION to choose a 32-bit
  build on 64-bit architectures. This is not exactly relevant anymore
  and has now been largely removed from OpenFOAM.

- simultaneously the newest version of OpenFOAM has rationalized the
  handling of special settings for KNL by rolling these into the
  compiler options. We now do the same thing here in spack.

  1. Reuse the internal variable arch_option to convey processor-specific
     optimizations and add these into the C++OPT=... statement.
  2. Drop spack support for configuring a 32-bit build on 64-bit
     hardware.

These changes can also be applied to older OpenFOAM versions, and to
various OpenFOAM forks without issue.

* update openfoam versions. New release 1906, patched 1812 version.

Some of the fonts now included in font-util need mkfontdir to build.

pkgconfig is the correct virtual dependency.

Commit ea3e1521 removed version
1.9.7rc2, making the patch for gcc@9 obsolete.

ncl does not build with newer versions of gdal (or rather proj). This
also needs a small change to gdal, otherwise we end up with both proj@5
and proj@6 in the spec.

- Separate `yaml-cpp` tests into variant
- Make conflict between `yaml-cpp` tests and `libc++` explicit

* added min version for gasnet and legion

* Update package.py

* Update package.py

* Update package.py

* Remove individual font-* packages and add them as resources of the
  font-util package
* Update font-util package to Autotools-based package, and call
  autoreconf to regenerate the old configure script
* Add font-adobe-utopia-type1