Remove uq prefix from files in src/core
Removing uq prefix from files in src/gp
Removing uq prefix from files in src/interface
Removing uq prefix from files in src/misc
Removing uq prefix from files in src/stats
Fix invalid identifier handle

Removing the uq prefix off of `uq2dArrayOfStuff` yields an invalid C++
identifier.  This commit renames all instances of these to `TwoDArray` instead.
Remove uq prefix in examples
Remove uq prefix from tests