v1.6

Fix to text loader (looktxt). Sanitized HDF and NetCDF, McStas import. Cross-checked and validated ResLibCal. iFunc models can now be used as objective function in optimization. Fixed iData/trapz style operators. fix R-factor estimate. (April 24 2014)
fix for the importation of McStas/McXtrace files. Added technical documentation. Fix in binary iFunc operators (Guess). Fix for the R-factor determination. Fix in text importer (looktxt).