helloBPWriter and timeBPWriter

Python bindings now working with PyBind11

Adding Variable<void> map container in ADIOS for unknown variable types
(until Write). This is required in Python.

Started implementation of bindings/python using boost::python
Modified Makefile to allow for dynamic library compilation

To do:
Work on time aggregation

Replaced vectors with map containers for Variables to avoid iterator
invalidation when adding element to a container. 

Continued debugging BP1 Writer for a single variable write

In ADIOS.h set default engine type according to access mode to BPWriter
(w) and BPReader (r).

Adde buildBP.sh for automatic test of examples/hello/bpWriter (bpReader
next)
 

Added BP1Writer pgindex and metadata functionality. Need to hook it with
BPWriter engine 

Added complex support in ADIOS class and DataMan engine and example for
DataManWriter

Modified Makefile.libs and Makefiles in ./examples/hello/datamanReader
and ./examples/hello/datamanWriter

Need to set DATAMAN_LOC in those makefiles for local DataMan
installation.

Need to set DATAMAN_LOCATION in buildDataMan.sh for local DataMan
installation.

Testing

see examples/hello/dataman and examples/hello/writer for working
examples

Added a bool flag in Variable to know if it is a dimension


To do:
Allow for passing values at DefineVariable

rather than handlers

Group&, Method& and the polymorphic std::shared_ptr<Engine> will be
returned by DeclareGroup, DeclareMethod and Open.

Added Group functions DefineVariable to be a template
Now using adios::Var when creating a variable (still a variable name
string).

Uses more C++ OO + templates features

Compiled and tested with ./examples/hello/helloWriter_OOP.cpp , mpi and
no-mpi versions