Now passing numpy array in DefineVariable
autopep8 syntax errors

Moved to sync functions
Added exception in EndStep if Perform Puts/Gets is missing

Remove Single variable or attribute
Remove all variables or attributes

If IO object to be used.
InquireIO returns nullptr if DeclareIO not called.
Two calls to DeclareIO with the same name will throw an exception

Modifying file names

To do: understand blocks per step at write for string

Resolving long ambiguity
Correcting APPLE MACROS

Add Path separator for Windows tests
And long long (Windows) vs long (Linux) type

Working on Fortran examples
Testing Row Major Reader
Debugging parallel read
Changed file open function
Added initial tests 1D and 2D

Attempting to solve HDF5 failed tests on summitdev

Remove cdash warnings for unused variables, type cast (including HDF5
char vs. int8) and virtual functions overloads.

Deactiveted ADIOS1 Attribute test
Solved clang-format format and camelCase issues

InquireVariable/Attribute working for valid name, but returning invalid
type

ADIOS constructor now has host language so bindings can change define
this at the constructor level

Separated C bindings from C glue (added) for languages using C-API (e.g.
Fortran)

Removed stl containers that pybind11 takes care of

BPWrite_c -> ctypes
XMLConfigTest.TwoIOs -> Test BP Writer 1

Continue refactoring IO, ADIOS classes

Passed ctest (MPI and nonMPI) excluding ADIOS1 engine, and Python bindings
HDF5, C bindings and C++ tests working
Introduced BeginStep EndStep functions
Renamed IO GetVariable/Attribute to InquireVariable/Attribute

Getting and defining available Variables at Open
Storing Variable position in Metadata, added to VariableBase
mpidummy: Added support for MPI_Reduce, MPI_Gatherv
Added utils and BPLS

Implemented basic buffer reading functionality
Added threading for bp serialization/deserialization
Refactored MPI functionality
Engine is now a reference
Initial Read API

Redesign the logic for C binding test with google framework.
In the future we should also add validation for binding tests.

Remove meaningless code(AddTransport which is not implemented yet) in
HDF5 test as well.

In this PR, I extend HDF5 native reader so that now hdf5 tests can read data
by selection(so called hyperslab selection in hdf5).

This PR also add testing for bp file name with path.

Since collective meta generation has not landed yet, I have to use
same attribute for all processes. Ideally attribute per process
should be unique to each other for testing purpose.