In some MPI implementations the self-consistent run of `sc_dmft.py`
resulted in random freezings. This issue was fixed by polling the
VASP lock file only on the master node.
Also, better exception handling is implemented, allowing all nodes
to exit properly in case of error.
* Fixed obvious bugs:
-- forgotten 'import re'
-- import user script by name from string
-- 'import converter' instead of 'import plovasp...'
* Number of iterations provided by the bash-script now has
an affect.
* Added a possibility to specify an alternative cfg-file
At the main SC script 'sc_dmft.py' requires importing a user DMFT
script as a module. Ideally, this should be implemented in a different
way so that the user script imports a function from the self-consistent
script.