Nothing

- Moved package rgl to Suggests as the future of OpenGL is uncertain. rgl is used as an optional preview in corr2d and is thus not essential to the package.

- Added publication in Journal of Statistical Software as preferred citation. The publication is a good start for newcomers to the field of 2D correlation spectroscopy (in R)!

- Added internal 'testthat' tests to corr2D to easier check correlation results during package development.
- Added a default print() method for corr2d objects (plot.default() for now).
- Changed plot_corr2d() to use plot() instead of plot.default() to enable method dispatch.
- Fixed a small error with the calculation of reference spectrum 2 (Ref2) if reference spectrum 1 (Ref1) is not present (Thanks to Bettina Gruen).

- Added 2T2D correlation analysis to the package. Function uses the approach described by I. Noda (2018) .
- A freshly published paper at The Journal of Statistical Software was added as a vignette. This will be updated in the future to also include descriptions of new functions.
- Added citation referencing the published paper at The Journal of Statistical Software.

- Added 2D codistibution analysis to the packages functions. Function uses the approach described by I. Noda (2014) .
- Rewrote the function plot_corr2d() for better control about the plot appearence. Introduced the graphical parameters "lwd", "lwd.axis", "lwd.spec", "col", "col.axis", "col.lab", "cex.axis", "cex.lab", "cex.leg", "font.axis" and "font.lab" which are/are derived from "par". "at.xaxs"/"at.yaxs" and "label.xaxs"/"label.yaxs" allow control over the axes ticks and thier labels. "line.xlab"/"line.ylab" control the position of the axes label.

- Rewrote the function plot_corr2d(): The graphical parameters specified at "..." are now partly transferred to all parts of the plot, not just the main screen.
- Cleaned up the image.plot() code inside plot_corr2d().
- Fixed a bug which prevented the use of an individual color palette in plot_corr2din3d().
- Changed the default color palette in plot_corr2din3d() from fields::timcolors() to colorspace::diverge_hcl(). This change should help to improve the default graphics quality.

- Corrected the default value for the normalization factor. It's now the number of perturbation variables which is NROW() of Mat1.
- Added error massages to all functions.
- Reworte the function sim2ddata() to allow to set C and Camp NULL. In that case only the first order reaction A -> B will be simulated and sampled.

- Added the function sim2ddata to simulate artificial data.
- Fixed the plotting of the reference spectra on the 2D correlation spectra. Before the reference spectra used an arbitrary x-axis. Now they use their correct spectral variables for plotting. 2D correlation peaks should now align with their 1D counterparts in the reference spectra.
- Rewrote the interpolation of the perturbation variables to no longer use the ineffective cbind in a for loop. Instead apply and sapply are now used instead.
- The interpolated perturbation variables are now saved when the perturbation values get interpolated.
- Cleaned up some left/right confusions in the documentation of plot_corr2d.

- Package is released on CRAN

- A new plot after a call of plot_corr2d() is plotted inside the main part. It's a consequence of keeping the split.screen of the main part active for interactive data readout and manipulation.

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