Added optinal parameters to RAdmin command admin_create_region

Added new optional parameters to the Remote Admin command
"admin_create_region". This Patch requires the previous Patch in commit
79125c3996d724952db34c7b2dc0dfc7485ccd9f
Add new admin_load_region command to RAdmin

Adding new admin_load_region command to RAdmin. The command enables one
to load existing regions into a simulator without restart.
Merge branch 'master' of https://github.com/Michelle-Argus/arribasim-dev