Bugs fixed: DF timeout and production assignment and UTC calendar.

 - Increased the time that the Directory Facilitators can use to search
for producers and consumers. In debugging mode the application crashes
if this parameters is not increased. So far, in production mode it is
not really necessary.
 - Changed the algorithm that finds out how much energy can offer a
productor. This calculation is performed within the method 'fillblocks'.
  - The calendar used to create the date of the CronScheduleItems uses
UTC by default.