JSON main script updated to read/create and activate the maintenance. Also topology 36 added to test it. Need to discuss on JSON notation

cleanup in conveyer blockage calculation. Dump of topology15 test changed after 6th decimal (check diff)

addBlockage added in CoreObject to add the blockage time in separate function. Called by removeEntity

interruptionActions added as CoreObject method. It is to be called whenever a CoreObject gets interrupted

topologies 31,32,33 are equivalent to 1,17,12 respectively. It is just that Machines are replaced with  OperatedMachines. Results coincide showing that if there is no need for operator the OperatedMachine works like standard Machine. First step in merging the 2objects

operated machine canAcceptAndIsRequested fix so that it calls haveToDispose of giver giving self as argument

operated machine changed so that currentOperator will be None and not 'None' if there is no operator in the machine

main script updated so that whenever a json object is expected and not found the default would be {}. So we do not need to have e.g. empty failures. Changes reflected also in several ropologies