deeptools/HiCExplorer: Late summer 2019 release

Adding the new captured Hi-C module. Viewpoint analysis based on a background model, significant interaction detection and differential analysis are provided. Thanks to @rgilsbach and @DonStephano . Adding documentation for captured Hi-C module and a tutorial on how to use it. Adding a module to be able to detect quite fast the quality of a Hi-C data set: hicQuickQC. Adding a tool to merge loops of different resolutions. Improving validation of locations: Presorting is no longer necessary; adding feature to add 'chr' prefix to loop or protein chromosome name Change loop detection slightly to improve results and fixed bugs: preselection p-value was ignored and only p-value was used adding additional test to the peak region test to decrease false discoveries exchanging pThreshold / ln(distance) to remove too low values by a share of the maximum value of the distance. New parameter 'maximumInteractionPercentageThreshold' Removal of the folder 'scripts' and its content. These were outdated scripts and will maybe part of regular Hi-C tools in the future