subsetSeuObjByIdent should handle multiple columns at once

[vertesy]

Describe the solution you'd like

• subsetSeuObjByIdent should handle multiple filters at once,
• implement by creating a PASS.xyz column temporarily in the @meta.data.
• negative filtering becomes tricky: it will now also be a vector

Now:

obj_TSC_tr <- subsetSeuObjByIdent(obj = combined.obj, ident = 'Genotype.orig', identGroupKeep = c("TSC2.p5", "TSC2.p24"))

After:

obj_TSC_tr <- subsetSeuObjByIdent(obj = combined.obj
, ident = c('Genotype.orig', 'age')
, identGroupKeep = list(
c("TSC2.p5", "TSC2.p24"),
"120")
)

Input

• ident = char vec of colnames
• identGroupKeep = list of vectors with matching values
• sign = boolean vector for + or - filtering

Output

• subset object