is beaing installed. Remove unused variables in the mpi2 util file.

This new slurm macro truncates the formatted time instead

code to keep the same logic as the original PMI2 library
implementation.

algo we have previously used.

Avoid side effect instructions and do not increment a counter while
accessing the array element but separate the instructions as per programming guide.

I've found several problems in the user guide. Some are cut/paste when replicating data types, some grammatical, or to make it read a little better.