relax SVN archive

Reverted the logic, that the chi2 Jacobian should be used.

Instead, the direct Jacobian exponential is used instead.

When fitting with the estimated errors from the Direct Jacobian, the results are MUCH better, and comparable
to 2000 Monte-Carlo simulations.

task #7822(https://gna.org/task/index.php?7822): Implement user function to estimate R2eff and associated errors for exponential curve fitting.

More locking of values.

This actually shows, that errors should be estimated from the Direct Jacobian.
Not, the chi2 Jacobian.

task #7822(https://gna.org/task/index.php?7822): Implement user function to estimate R2eff and associated errors for exponential curve fitting.

More locking off values, when trying to use different methods for estimating R2eff err values.

task #7822(https://gna.org/task/index.php?7822): Implement user function to estimate R2eff and associated errors for exponential curve fitting.

Locked values for systemtest test_estimate_r2eff_err, to estimate how the R2eff error estimation reflects on fitted parameters.

task #7822(https://gna.org/task/index.php?7822): Implement user function to estimate R2eff and associated errors for exponential curve fitting.

Added digit to print out in R2eff estimate module.

task #7822(https://gna.org/task/index.php?7822): Implement user function to estimate R2eff and associated errors for exponential curve fitting.

Modified systemtest verify_estimate_r2eff_err_compare_mc() to first use the direct function Jacobian, and then the chi2 derived Jacobian.

This shows the result better.

task #7822(https://gna.org/task/index.php?7822): Implement user function to estimate R2eff and associated errors for exponential curve fitting.

Made the user function, which estimates the R2eff errors, use the Jacobian derived from chi2 function.

task #7822(https://gna.org/task/index.php?7822): Implement user function to estimate R2eff and associated errors for exponential curve fitting.

Cleaned up code in R2eff estimate module, by making each function independent of class.

This is to give a better overview, how the different functions connect together.

task #7822(https://gna.org/task/index.php?7822): Implement user function to estimate R2eff and associated errors for exponential curve fitting.

Started making functions in R2eff estimate module, independent on the informations stored in the Class.

task #7822(https://gna.org/task/index.php?7822): Implement user function to estimate R2eff and associated errors for exponential curve fitting.

Fix for the recent lib.period_table and lib.physical_constant module changes.