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Fix several bugs in the temperature interpolation: 1) define albanyTemperaure
array size using nCells instead of np.max(cellID_array), which was causing
an error in some cases; 2) remove if-statement that separates temperature
from velocities based on number of vertical levels/interfaces (no longer needed
with current interpolation scheme, and was not working anyway); 3) stagger
albany and mpas temperature layers for interpolation by subtracting 0.5 from
MPAS_layers.

Equally-spaced temperature layers works in general because
MPAS temperature layers are always halfway between Albany temp
layers, and we use linear interpolation. Add a comment to explain
that to the user.