cooccurrences issue

[PolMine]

library(polmineR)
use("GermaParl")
... activating corpus: germaparl
... activating corpus: germaparlmini
foo <- cooccurrences("GERMAPARL", query = "Liebe")

[PolMine]

There was a problem when a query occuurred at the very beginning or at the very end of the corpus. Then the context window would potentially transgress the beginning / end of the corpus, causing an error or even a crash without being checked. Now, there is a check that prevents this behaviour.