Fixes #3

subrepo:
  subdir:   "packages/Catch2"
  merged:   "9e1bdca4"
upstream:
  origin:   "git@github.com:catchorg/Catch2.git"
  branch:   "master"
  commit:   "9e1bdca4"
git-subrepo:
  version:  "0.3.1"
  origin:   "git@github.com:ingydotnet/git-subrepo.git"
  commit:   "a7ee886"

subrepo:
  subdir:   "packages/CLI11"
  merged:   "da901cca"
upstream:
  origin:   "git@github.com:CLIUtils/CLI11.git"
  branch:   "master"
  commit:   "da901cca"
git-subrepo:
  version:  "0.3.1"
  origin:   "git@github.com:ingydotnet/git-subrepo.git"
  commit:   "a7ee886"

subrepo:
  subdir:   "packages/rang"
  merged:   "f09d567d"
upstream:
  origin:   "git@github.com:agauniyal/rang.git"
  branch:   "master"
  commit:   "f09d567d"
git-subrepo:
  version:  "0.3.1"
  origin:   "git@github.com:ingydotnet/git-subrepo.git"
  commit:   "a7ee886"

Feature/io

See merge request code/pastis!9

This is made in view of parallelism. One will be able to silent processors
or/and produce file output

Provides new objects:
- pout() -> cout
- perr() -> cerr

Now indicated build options, compiler and enabled Kokkos devices in execution
preamble

- Define ItemValue
  allow to define generic arrays defined on connectivity items
  data is accessible through item identifier (avoids confusion e.g. calling cell
  data using a node index). Cannot use integer indices to access data.

- SubItemValuePerItem is now indexed by item identifier

- Introduce Array<T> which encapsulates Kokkos::View<T*>
  Array replace Kokkos::View when ItemValue cannot be used (not data per item)
  ItemValue internally uses Array

- ReduceMin and ReduceMax are defined as generic class-functions operating on
  arrays (which must honor .size() and ::data_type).
  Casts to the type of the content of the array to obtained reduced value.

- Encapsulate as many Kokkos feature as possible

- Code clean-up
  'typedef' is replaced by the cleaner 'using' type aliasing

Feature/kokkos encapsulate

See merge request code/pastis!8

This may be temporary

Replace following macros
- KOKKOS_FORCEINLINE_FUNCTION -> PASTIS_FORCEINLINE
- KOKKOS_INLINE_FUNCTION -> PASTIS_INLINE
- KOKKOS_RESTRICT -> PASTIS_RESTRICT

Feature/itemvalue

See merge request code/pastis!7

Returned type is now ItemId

Get rid of dirty reinterpret_cast's

Seems necessary to impose more than 2 threads to activate join() on these simple
examples

This unfortunately implies a redesign of connectivity matrices access
Ugly reinterpret_cast were temporarily placed to keep code functional

Now ItemValue are indexed by ItemId.
This means that for instance, one can only access to NodeValue using a node
number: using another item type number will fail to compile, as well as using an
integral type (int, size_t,...).

This is a zero cost developing helper.

It remains to clean some data structures to ease even more coding.

'typedef ConcreteType AliasType;' -> 'using AliasType = ConcreteType;'

This is much cleaner

This allows to use ArrayUtils method on their instances

It is set by 'using data_type = T'

It was redundant with ItemValue::operator[](const size_t&)