C API and reading a string value

[pnorbert]

In a C application we need to pre-allocate the memory to read in a string value. We need to have a function to retrieve the size of the that value, so we can allocate the correct amount of memory.

[pnorbert]

Better yet: allocate the memory inside ADIOS for the string or string arrays, and let the app only free it manually when done with it.