plot_pca_projection_only: Plot PCA projection only
In KSheu/ksheu.lib: KSheu Library1

Plots projection from rotated.scores file (output of intersect_do_PCA_and_project_second_dataset)

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plot_pca_projection_only(rotated.file2, info.name, info.type,
  title = "Projection", labels = TRUE, PCx = "PC1", PCy = "PC2",
  ellipse = F, conf = 0.95, density = F, fliph = F, flipv = F)

`rotated.file2`	File containing scores matrix
`info.name`	Vector of sample names
`info.type`	Vector of sample types in the same order
`title`	Title of the plot
`labels`	default=T
`PCx, PCy`	PCs to display
`ellipse`	Construct confidence region based on groups in info.type, default = T
`conf`	default = 0.95
`density`	plot x-y density plots
`fliph, flipv`	flip plot hoirzontally or vertically