add OpenMP critical section around 'save' data
add OpenMP critical section around 'save' data

some day we might want to call integral API functions
from threads, in which case we will need to serialize
access to thread-unsafe data, i.e. that which has
the save attribute.

alternatively, we could use threadprivate, but
then we would like see O(n_threads) warnings.






rangsimanketkaew/NWChem