Fix clang compiler warning concerning cast of int to string. Using
strimgstream for conversion since we don't have C++11
Clean up main CMakeLists.txt - collect build options at top, shuffle around
some options. should all be harmless.
FW UPDATE 2.16 - this adds some additional delays after setting dacLow
values in test loops. This fixes #95. Requires firmware update to 2.16
corelib version bumper to 0.9.8