Prevent reinstalling same version of existing module with load or reinstall

[isc-dchui]

Resolves #889

This is a backwards incompatible change as it changes the default behavior to blocking same-version reinstall. There are 4 ways of getting around this block.

1. Use reinstall command
2. Pass the -force flag to load or install
3. Pass the -DPermitReinstall=1 data flag to load or install
4. Include this snippet in `module.xml:

<Defaults>
    <Parameter Name="PermitReinstall">1</Parameter>
</Defaults>