The --enable-relax-coord-bound option was added in 1.8.0. NetCDF
4.6.3 enabled relax coords by default and required it from PNetCDF.
PNetCDF 1.10.0 enabled it by default but for versions between 1.8.0
and 1.10.0 it should be enabled explicitly.

CUDA 10.0 provides Compatability libraries for running newer versions
of CUDA with older drivers. These do not work with newer drivers.

* megadock: new package at 4.0.3

* megadock: remove CudaPackage redundancies

* megadock: move env vars to build targets, use cuda_arch variant

* megadock: flake8 fixes, more flexible mathlib

* Fix py-yt for Python 2 by requesting older py-ipython version.
* Add conflicts statement to py-ipython because version 7: is not
  compatible with python@2.7

Remove a vestigial print statement introduced in #8570

* rename py-pauvr to py-pauvre

f242f5f8 removed spec.architecture.platform_os, which was used to test
an option in the 'm4' package. The attribute is now accessed as
'spec.architecture.os'.

- Trying to get our Python 2.6 tests working again.
- This seems to crash travis in the 2.6 environment, for whatever reason.

* Add versions 3.27.{0,1,2} and 3.28.0
* Add url_for_version: the URL format includes the year so this
  function maps version ranges to years
* Restore patches for versions removed in 84c547cf: this commit
  removed versions before 3.26.0 due to a security issue with FTS
  support. Add a +fts variant (default true) that enables FTS
  support along with a conflict for +fts with earlier versions.

- Codecov cannot handle as many coverage reports as we are generating

- as a result, our PR coverage pages have been broken for a while, and
  it's hard to tell people where to enhance their testing in PR reviews.

- Scale back to only running coverage for 3.7 and 2.7 unit tests

- This is *probably* better.  We run the build tests for good measure,
  but we do not need to evaluate them for coverage.  The coverage reports
  are about unit tests.

* py-pauvr:new package

* py-pauvr: using url and Releases

* py-pauvr: remove extra comments

* Don't overwrite suid/sgid bits when setting permissions
* add tests for permission setting

Add fixes to support multiple installs and dependents using a subset
of IntelPackage functionality.

* Update IntelPackage to only return scalapack libraries if the root
  spec depends on MPI: scalapack requires MPI to be mentioned as a
  dependency in the DAG. Package builds using intel-mkl for its
  blas/lapack implementations but not for scalapack were failing to
  build.

  Ideally it would be possible to ask if any of the packages in the
  DAG are actually requesting the scalapack functionality provided by
  the IntelPackage and only return scalapack libs in that case, but
  that is not easily done at this time.

  Fixes #11314
  Fixes #11289

* set HOME when the intel silent installer is run. This prevents the
  installer from using the ~/intel directory (which can cause
  conflicts for multiple installs of the same IntelPackage)

  Fixes #9713

Use new `module` function instead of `get_module_cmd`

Previously, Spack relied on either examining the bash `module()` function or using the `which` command to find the underlying executable for modules. More complicated module systems do not allow for the sort of simple analysis we were doing (see #6451).

Spack now uses the `module` function directly and copies environment changes from the resulting subprocess back into Spack. This should provide a future-proof implementation for changes to the logic underlying the module system on various HPC systems.

The license text is now expected to match almost exactly (not
accounting for formatting in different file types (e.g. rst vs.
bash script vs. python)

* Starting with the upcoming 10.1 release, Dyninst changed the names of
  some cmake args to camel case: LIBELF_* to LibElf_* and LIBDWARF_* to
  LibDwarf_*.  This change is needed now for @develop and will be used
  for 10.1 when it is released.
* New versions of Dyninst now requires cmake version 3.4.0 or later.
* Restrict boost dependency version to < 1.70.0 to avoid build error

... and apply this in SIRIUS, CP2K & QE.

Thanks to @scheibelp for the idea.

Use tarballs instead of git tags

Fix openpa dependency on gcc < 4.9

Fix boost dependency

Change sm variant default to true