Description:

• Querying the variable id and clamping value for each state element.
  In pert_model_copies the state vector is spread out round-robin across the processors, so the check for clamping value must be done for each element.

• INDICES loop is now INDICES : do i = 1, state_ens_handle%my_num_vars. Previously the INDICES loop was
  INDICES : do i = start_ind, end_ind which caused pert_model_copies to segfault.

• Removed module global random_seq since this is not used.

Fixes issue

fixes #360

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Documentation changes needed?

• My change requires a change to the documentation.
  • I have updated the documentation accordingly.

Tests

Perturbed MIT ocean test case.

Checklist for merging

• Updated changelog entry
• Documentation updated
• Version tag

Testing Datasets

• Dataset needed for testing available upon request
• Dataset download instructions included
• No dataset needed

Here is a test case for filter log_transform=.false.
/glade/scratch/hkershaw/DART/MITgcm/test_small_domain.no-nans.no-log

And for log_transform=.true.
/glade/scratch/hkershaw/DART/MITgcm/test_small_domain.no-nans.log