reg_gam: Plot one gene raw data and its regressions
In strayMat/warpDE: Differentially expressed genes in cell lineages

Tools for visualizing gene signals for one given gene with the gam framework.

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reg_gam(data, gene, reg.f = "loess", span = 0.75, s.df = 4,
  regression = T, null.model = T, npred = F, sd.show = F,
  legend.show = F)

`data`	a `warpDEDataSet` with results to be plotted.
`gene`	character, a gene of interest.
`reg.f`	a function to perform regression, either "ns" for natural splines, "loess" or "s" (default is "loess").
`span`	numeric, a smoothing parameter for the regression function (default is 0.75, see `gam::lo` for details).
`s.df`	numeric, a smoothing parameter for the nsplines regregression (default is 4, see `splines::s` for details about regularization).
`regression`	logical, if the loess regression is to be computed and plotted or not (default is TRUE).
`null.model`	logical, if the null model is to be computed and plotted or not (default is TRUE).
`npred`	logical, if the unshared part of the data is to be plotted or not(default is FALSE).
`legend.show`	logical, if the legend is wanted (default is FALSE).