Delete DataTypes.

[brendan-nasa]

On it's (de)merits:

• C++03 instead of C++11 or later (no nullptr, raw new/delete, no override) (boo)
• Better design than current memory manager (yay)

Perhaps leave it on a feature/ICG2 branch until ready to merge in. Would need an update to C++17 (C++20?).

[coveralls]

coverage: 56.668% (-0.003%) from 56.671% — deleteDataTypes into master