limited size of int type

[Ethan999]

When setting:
NSCALES=4
NMOMENTS=3
NX=4096
NY=4096

Run test_cleaners.sh, will occurs error：
terminate called after throwing an instance of 'std::bad_array_new_length'

Because in the code, we need to calculate the value of
nscales * nscales * nmoments * nmoments * ny * nx, which is beyond the limit of int type.
Changed the type from 'int' to 'long', it can run successfully. But "Cleaners Error" is huge.

Test Cleaners
================
Cleaners Error (m_model, relative) : 1
Cleaners Error (residual): 8.78635e+97

So what will be the reason of such big error?