hdf5_ep

[svn-r28926] Purpose: Fix user reported problem
Description:
    User Adam Rosenberger reported a failure when using the member function
    AbstractDs::getArrayType().  This problem was caused by missing
    initialization of the ArrayType's members in some cases.
Solution:
    - Added ArrayType::setArrayInfo() to retrieve rank and dimensions of
      an array and store them in memory for easy access.
    - Re-factored a few functions to use the new function.
    - We'll give him 1.8.16 patch
    Merged from trunk r28905
Platforms tested:
    Linux/32 2.6 (jam)
    Linux/64 (platypus)
    Darwin (osx1010test)