RchivalTag versions

RchivalTag_0.0.5 -- June 8, 2017 (Robert Bauer)
	- adding average and standard deviation estimation for depth and temperature values insisde the read_histos and ts2histos functions

RchivalTag_0.0.4 -- April 25, 2017 (Robert Bauer)
	- improving performance (speed) of plot_TS/plot_DepthTS

RchivalTag_0.0.3 -- April 10, 2017 (Robert Bauer)
	- small bugs fixed in plot_TS/plot_DepthTS and read_PDT

RchivalTag_0.0.2 -- March 22, 2017 (Robert Bauer)
	- small bug in hist_tad/hist_tat functions fixed
        - adding example on back-to-back histogram for day vs night TaD-data (see: ?hist_tad)
