2016-03-09  Anton Gagin <av.gagin@gmail.com>
        * Version 0.1-6
        * inst/gui/server.R: added possibility to download PDF with corresponding uncertainty intervals prior to background estimation 
        * revised help file

2015-09-03  Anton Gagin <anton.gagin@nist.gov>
        * Version 0.1-4
        * R/interface.R: function set.sigma() now uses `wmtsa` package for signal denoising
                         functions read.sqa(), read.sqb(), and read.data() now deal with NaN data
        * inst/gui/server.R: added possibility to calculate and plot PDF with corresponding uncertainty intervals prior to background estimation 
                             added possibility to rescale y-scale sliders
                             solved truncate-input  problem
                             added possibility to download split PDFGetN .sqa-files
                             
2015-09-03  Anton Gagin <anton.gagin@nist.gov>
        * Version 0.1-3
        * R/interface.R: added function fix.merge() to merge PDFGetN .fix-files
        * R/interface.R: added function sqa.split() to split PDFGetN .sqa-file into individual files for each databank 
        * inst/gui/server.R: "Download .fix file" now fills with zeroes truncated regions