W503 and W504 are issued for line breaks before or after binary
operators (respectively). This allows either approach (explicitly
instructing flake8 to ignore both of these cases).

fixes #9624

merge_config_rules was using `strict=False` to check if a spec
satisfies a constraint, which loosely translates to "this spec has
no conflict with the constraint, so I can potentially add it to the
spec". We want instead `strict=True` which means "the spec satisfies
the constraint right now".

* updated visit package

* make hdf5 and silo conflict with ~gui variant

* Changed parallel => mpi and quotes in description

* Corrected +mpi variant in VisIt package

The previous commit introduced a bug (+parallel variant wasn't renamed +mpi), and the +mpi variant wasn't True by default. This is corrected.

- #8773 made the default mode 0o777, which is what's documented but
   mkdirp actually takes the OS default or umask by default

- revert to the Python default by default, and only set the mode when
  asked explicitly.

arrow: add missing dependency for python build

The Parquet library moved into the Arrow organisation, hence add a
parquet flavor and adapt dependencies.

* flux: ensure git tags are always available

previous `--unshallow` would only run when `--depth 0` was used.  If
1--single-branch` was used, then the `.git/shallow` file would not exist
and `--unshallow` would not work.

add v0.6.0 and update dependencies accordingly

update dependencies to match latest flux versions

adds support for python 3
increases precision of czmq version required for older flux versions
adds new lz4 dependency

* Add stat version 4.0.1
* stat 4.0.1: requires py-xdot
* stat versions at or above 4.0.0 dont require python 2 (it still
  requires python but can build with 2 or 3)
* stat versions at or above 4.0.0 dont require py-pygtk and py-enum34
* Replace py-xdot version 0.9.1 with 1.0
* py-xdot: use lib directory vs. lib64 for atk dependency

#9100 added a warning message when a path extracted from a module file
did not appear to be a valid filesystem path. This check was applied
to a variable which could be a list of paths, which would erroneously
trigger the warning. This commit updates the check to run at the
actual point where the path has been extracted.

* Add version 18.9.0 (w/CMake)
* Add version dependent install methods to handle transition from
  Make-based package (17.1) to CMake-based package, using the NEST
  package as an example
* Remove unnecessary build_targets method for older Make-based
  version
* Don't retrieve just the C/Fortran interfaces for netlib-lapack -
  blas/lapack libs are now handled the same for all implementations
* Remove netlib-lapack detection patch

Previously, if you built the docs, you'd get license errors for
generated .rst files. This removes them from the list of licensed
files.

* add new version 3.1.0
* add conflict for parmetis without mpi
* strumpack >= 3.1.0 uses -DTPL_ENABLE_<package> instead of
  -DSTRUMPACK_USE_<package>
* require cmake at least 3.2

py-gtk needs to build with python@2.7 and also requires atk, so the atk python dependency cannot be unconditionally constrained to @3: (#9596)

* plumed: add libmatheval dependency (used by the 'function' module)
* guile: add variant to build with threads interface
* libmatheval: add flex dependency

Also add its dependency, py-fypp

Added version available in RHEL/Centos 7

* Add support for samrai+silo.
* Add patch for SAMRAI 2.4.4

This adds a pic variant and also exports all compiler flags as CMake
arguments