Standardize column names when initializing data

[z3tt]

Currently, the naming of columns seems to be inconsistent. I was trying the GSE72056-scmelanoma data set which caused some problems as ggplot couldn't find the correct columns.

In the genePlots_tsne.RENDER() function, the returned columns for position are tSNE.x and tSNE.y for the example data but X1 and X2 for the melanoma data.

[ivokwee]

This is because using base plots we didn't rigorously checked the column names, but for example just use the first two columns. The functions pgx.initialize() after loading, could be used to update/standardize namings.

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