Preliminary support for automatic restart.
 Restart for HaydockBseTask.
 Add auto_restart flag to AbinitFlow and new node status S_LOCKED
Merge remote-tracking branch 'mpmaster/master'
 Chage g0w0_flow so that we can pass multiple inputs for SIGMA.
 Add possibilty to select the autoparal configurations with a Mongodb-like syntax
 (ony comparison and logical operators are supported)
 Ignore ImportError in boltztrap.py while importing matplotlib (it's not a mandatory requirements of pymatgen)
Merge remote-tracking branch 'mpmaster/master'
 Make EventsParser more robust (sanitize text fields, catch errors ...)
 Test whether abinitio objects can be encoded/decoded with pickle.
 Fix bug in the setter methods uses for the TaskManager.
 Force scheduler shutdown if len(errors) > NUM
 Make PseudoParser more robust (don't stop if file format is wrong but the error is not critical!)
 Fix unit tests for Workflows
Merge remote-tracking branch 'mpmaster/master'
 Cleanup abinitio docstrings
 Typo in latex equation.
Cleanup.