o: added utility methods
e: added discspace and memory columns in machine table
o: removed deprecated methods in MySQL Database backend
b: fixed SQL queries
e: now use ListJobServer.list to query jobs in getJobOutput and getCompletedJobOutut
o: renamed variables
e: refactoring and fixed list jobs according to date parameters
o: change loop index incrementation
o: misc refactoring: indentation, variables renaming, remove using namespace...