STYLE: integrateLimits() -> integrate() for consistency with
DataEntry/polynomial. Rename old 'integrate', 'integrateMinus1'
methods to 'integral', 'integralMinus1' (ie, substantive instead of
verb for clarity).
OLD timings:
~~~~~~~~~~~~~~~~~~
evaluate: -6.82572e+31 in 10.38 s
hard-coded 0: -6.82572e+31 in 0.2 s
hard-coded 1: -6.82572e+31 in 10.37 s
hard-coded 2: -6.82572e+31 in 0.24 s
New timings:
~~~~~~~~~~~~~~~~~~
evaluate: -6.82572e+31 in 0.11 s