Moved FindOctave.cmake

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Fixed typo in incompressible fluid files

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
JSON packaging is slightly improved - no injection every time; Build incompressible JSON library

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>