ATAN implementation and tests
TAN function
TAN tests
Sqrt and Division operators
operator divide functionality
division features
more division op functionality
make more ops final
add ABS operator
op apply to INDArray
ABS apply to AVector
Square op, Abs fixes
ArrayVector signum
Signum op, misc edits
rounding operators
Log operator
extra Log tests
add LOG10 operator
log10 testing
add COSH nd SINH ops