add option to IOUtil and CarpetIOHDF5 to read datasets into different variables

Extents the file readers capabilities to not only take a cctk_iteration string but also a string alias. I value of

IO::filereader_vars = "hydrobase::vel[0]{alias=admbase::shiftx}"

weill read the datasets admbase::shiftx into the variable hydrobase::vel[0]. The idea is to be able to read variables of evolution thorns into postprocessing thorns.

The IOUtil patch adds the options to the parameter parsing routines and the CarpetIOHDF5 patches have CarpetIOHDF5 act on them.

Consider as a request for comments.

Keyword: CarpetIOHDF5

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