Logging now working

* Logging of CRAB outputs will now be saved in a log file with the name including the task name and the current date and time
* Some bug fixing
Full rewrite of command issuing and new features

* Now using argparse package for CL arguments management
* Implements an 'CRAB Silent" option that allow disabling CRAB output to command line
* Now all CL prints have indentification saying they came from this program
* New way of issuing commands with usage of temporary files (instead of PIPE) to avoid a python bug that deadlocks program
* Removed redundant CL print outs
* Making a dictionary with the count of how many jobs have each type of status and printing a summary with that information
* Accounting for new status and 2 new error coded
* Able to deal with multiple directories at once
* Outputing log files with time and data for each task (same time and date if dealing with multiple directories in one go)