D10.1 Berlin project head and client-specified IV's

New compiler version project heads and client-specified IV's:

1. New project heads for D 10.1 Berlin and XE8
2. Capability for clients to specify thier own initialization vectors (IV's). This is for noncible block-mode ciphers. Normally these are automatically generated.
3. Removed reliance on range and overflow checking being set OFF in the project options. Now certain ciphers work even if these options are set ON in the client's application project options.
4. Upgrade the unit test suite from using the old DUnit framework to the much better dunit-m framework. Some minor memory leaks have been exposed in the process. (work is underway to remediate these leaks).