First release of "singularity" software

This is the first release of the "singularity" software for numerical methods for multifractal singularity analysis of 1D (time-series) signals.

This source code was released as is together with the following publication by Turiel et al.:

• Turiel A., Pérez-Vicente C.J., and Grazzini J. (2006): Numerical methods for the estimation of singularity spectra on sampled data: a comparative study, Journal of Computational Physics, 216(1):362-390, doi:10.1016/j.jcp.2005.12.004.

Currently, no further development is planned.