- Check if data.bp is present. If yes, read from it. If not, fall back to standard IO.

    - The only working variant for write is BeginStep() and EndStep() in Mode::Append. Other variants of writing have issues, see commentary in adiosWrite.C
    - Save only double arrays => all adios templates are instantiated with double* instead of char*.
    - Refactor adios classes. Pull adios write and read functionality out of adiosCore into seprate classes. Clean up.

Example of a subdict in controlDict:

DebugSwitches
{
    dictionary 2;
    IOobject 1;
    time 1;
    DebugIOList 1;
    DebugIOField 1;
    volScalarField 1;
    volVectorField 1;
    OFstream 1;
    ISstream 2;
    IFstream 1;
}

Note that some of the switches have several level of verbosity, i.e. much more ouput if set to 2.

Required to have multiple writes without overwriting.
Plus, new placement of ADIOS2 file in case folder.

Replaces previous data split.

- The id consists now of the relative path to the file and the keyword / block name.
- Every keyword given to an OFstream object lands in the LIFO stack. This means that the internalField id is available when needed.
- The stack is poped if a token::END_STATEMENT is seen by the OFstream object.

Usage:
- Set environment with WM_THIRD_PARTY_ADIOS2_271=1 (see also etc/bashrc)
- Compile with Allwmake.firstInstall

The minimal example of an ADIOS2 interface in foam/db/IOstreams/A2streams illustrates linking against the extended ThirdParty.

- Transfer the block name from UListIO to OFsteam if indent is incremented and keep it in a LIFO stack.
- Pop LIFO stack if indent is decremented.
- Get the identifier from OFstream via getBlockId().

To turn on debug output put a DebugSwitch dict into controlDict, e.g.:

DebugSwitches
{
    OFstream 0;
    IOobject 0;
    regIOobject 0;
    objectRegistry 0;
    time 0;
    DebugIOUList 1;
    DebugIODimensionedField 0;
    DebugIOField 0;
    Ostream 2;
    OSstream 1;
}

Note that the switches may have a value higher than 1 to allow more output.

IO split of writing binary data into separate file. Activate with 'writeFormat parallel' in controlDict.

Alter the foamInstall path. ThirdParty is not included. Either alter WM_THIRD_PARTY_DIR to point to an existing one or download it from the foam-extend repo.

Add mini version of foam-extend-4.1, branch ubuntu2004, commit b42fb8a3.

The reduced version functionality is suffiicient to run icoFoam. The compilation time is substantially lower since only basic libraries are included.