Add min resources and limit max lease amount

[sorudev]

Hello, might be good idea to set minimum resource allocation allowed as currently you can allocate almost 0 resources. Also lease amount can exceed evr max supply.

Specify the total memory in megabytes to distribute among all contract instances: 1
1pecify the total Swap in megabytes to distribute among all contract instances:  
Specify the total disk space in megabytes to distribute among all contract instances: 1
Using allocation 0 GB memory, 0 GB Swap, 0 GB disk space, distributed among 1000 contract instances.

Specify the lease amount in EVRs for your contract instances (per moment charge per contract): a
Lease amount should be a numerical value greater than zero.
Specify the lease amount in EVRs for your contract instances (per moment charge per contract): 10000000000000000000000
Lease amount set as 10000000000000000000000 EVRs per Moment.