bug1: when writing value characteristic bpdump requires the length before the value
bug2: fixed merging serialized collective metadata index

examples/hello/bpTimeWriter/helloBPWriteStep.cpp

examples/hello/bpWriter/hellBPPutDeferred.cpp

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

Callback Signature classes extend Operator
Operators can be used per Variable, IO or Engine

Continue refactoring IO, ADIOS classes

Changed m_Transports from vector to map, needed by subfile manager

BP3 Deserialization:
Getting subfile seeks and intersection info
Set host language in bindings for row-major and zero-index info

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

Reduce verbose debug info in CircleCI

Add CircleCI shield

CMake: Use upstream FindHDF5 from CMake 3.9

Fix global array definitions in ADIOS1 test for 2D Arrays

Continuous integration on circle (parallel)

Fortran 90 bindings

Implementation of attribute bp data and index

Testing and Examples issues after merging with master for conflicts
Fixing non-MPI issue
C enums and Fortran parameters now compatible

Conflicts:
	CMakeLists.txt
	bindings/CMakeLists.txt
	bindings/c/adios2/adios2_c_enums.h
	bindings/c/adios2_c.cpp
	bindings/c/adios2_c.h
	cmake/DetectOptions.cmake
	examples/hello/bpWriter/CMakeLists.txt
	testing/adios2/bindings/CMakeLists.txt
	testing/adios2/bindings/c/TestBPWriteTypes_nompi.c