v0.5.0

• Added function qPr() for the computation of quantiles and their variability.

• Corrected some bugs.

• NB: learnt objects created with versions < 0.5.0 are incompatible with the functions of version 0.5.0. To convert to the new version, use the function util_learntvar2sd(file), where file is the path of the learnt object to be converted.