clean up csca.R

[kfuku52]

• phytools dependency is real?
• remove remnant codes like this. https://github.com/kfuku52/amalgkit/blob/72b2009d9e0a437244b755b1e2e0749a2d64ec87/amalgkit/csca.R#L530-L531

[kfuku52]

@Hego-CCTB Have you ever got csca to work properly? The current code even depends on the species tree, which should be totally unnecessary..

[kfuku52]

@Hego-CCTB Could you provide an example of multisp_pca_maxGenePerOG*.pdf ?

[Hego-CCTB]

I haven't touched csca since the initial integration into amalgkit, which was done here: https://github.com/kfuku52/amalgkit/issues/13

In that issue I posted my csca output, which is this file: csca.zip

That one contains 2 multisp_pca_maxGenePerOG*.pdf files

[kfuku52]

Thanks! The problems have been solved in my recent commits.