ggplot has no subset argument anymore in v2

[holgerbrandl]

See tidyverse/ggplot2#1498 (comment)

We use it twice in roi/RoiTrackingMovies.R which need to be changed.
Since they've just removed the feature without adding a new scheme it might be tricky to fix it.

[etournay]

The hulls are anyway not documented in TissueMiner.
Therefore I would comment these lines out and assign a low priority to this fix.

[holgerbrandl]

@etournay I've moved the rest of your comment into #8

[holgerbrandl]

unassigned for now since you said it's low priority but it's hard to fix I think.

[holgerbrandl]

this looks like a fix
http://stackoverflow.com/questions/35806310/ggplot-plotting-layers-only-if-certain-criteria-are-met