Correction of config file

Update Sim/Main.ini to correctly point to “Sim/Grid/GridCommon.ini”
Migration docs update

Update migration to 0.9.2 info to explain the transfer of old
configuration settings to the new format
Update Startup commands processing

Add comments to startup_commands.txt and shutdown_commands.txt
explained use.
Comment out startup & shutdown by default in WhitCore &
WhiteCore.Server ini files (i.e. not used by default)
Add additional checks to allow comments in the startup_shutdown command
files
RealEstate user creation update

Generate a random password upon creation, printed to console.
Set RealEstate user to maintenance level access.