relax SVN archive

Renamed systemtest, that test the user function for estimating the R2eff error:

test_estimate_r2eff_err, test the user function.
test_estimate_r2eff_err_methods, test different methods for getting the error.

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

Removed unnessary call to eksperimental Exp class.

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

Inserted checks for C module is available in module for estimateing R2eff error.

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

Moved code around, and made function multifit_covar() independent of Class object.

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 error module. Also removed a non working Hessian matrix.

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

Added several tests to: test_estimate_r2eff_error, to compare different output from algorithms.

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

Fix to systemtest test_estimate_r2eff_error(), to first delete the old error estimations.

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

Added back-end to estimate R2eff errors.

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

Modified systemtest Relax_disp.test_estimate_r2eff() to first do a Grid Search, then minimise and then estimate the errors for R2eff and i0.

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

Added method to automatically perform error analysis on peak heights.

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