Remove an old data visualization call in change_e.r

data.new[[1]] was used during debugging and is not needed
or wanted when running the package.
implement log correction when sampling the mean size-at-age data in change_e

Sampling takes place to generate random normal samples from the mean
size-at-age matrix which are then fed to the external growth estimation
function. Sampling is done using a normal distribution with logged data.
The standard deviation is now corrected using code from Cole.
Implement better code in change_e that finds the true cv rather than hardcoding.

The true cv is found in the OM using grep and used as the cv
of the sampling protocol for generating data which is then fed
to the external growth estimation routine.
The function can now be used with OM's that have different cv's
for young ages.
HACK change_e to sample mean size-at-age data for external estimation

These lines will need to be removed once Cole's sampling functions are in
place, but until then it works for the estimation group.
Samples the data and then deletes it so the data is no longer available
to the EM.