Fortran bindings support for global variables (with test)
Added Fortran function name in error message to improve debug info
Added parameter (FlushStepsCount) control flushing of BP metadata files
at Write

Working on Fortran WriteRead test

Switched from ADIOS2 to ADIOS

AtIO returns a reference to IO or throws an exception since IO must
exists
Similar to C++ STL containers at function

Identify the bp version in buffer

Moved Variable start from 1 to 0

Modified tests for allowing stepping read mode
Made PerformPuts and PerformGets optional

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