convert citEntry to bibentry

inst/CITATION

@@ -1,8 +1,19 @@
-citHeader("To cite apcf in publications, please use:")
 
-citEntry(entry="Article",
-  title=paste("Adapting the pair-correlation function for analysing the",
-    "spatial distribution of canopy gaps"),
+bibentry(
+  bibtype= "Misc",
+  header = "The software package:",
+  title = "apcf: Adapted Pair Correlation Function",
+  author=person("Robert", "Nuske"),
+  license = "GPL-3.0-or-later",
+  year="2022",
+  version="0.3.0",
+  doi="https://doi.org/10.5281/zenodo.2535612"
+)
+
+bibentry(
+  bibtype= "Article",
+  header = "The article describing the method:",
+  title = "Adapting the pair-correlation function for analysing the spatial distribution of canopy gaps",
   author=c(
     person(c("Robert", "S." ), "Nuske"),
     person("Susanne", "Sprauer"),
@@ -11,12 +22,7 @@ citEntry(entry="Article",
   journal="Forest Ecology and Management",
   volume="259",
   number="1",
-  pages="107--116",
+  pages="107-116",
   year="2009",
-  doi="10.1016/j.foreco.2009.09.050",
-  url="https://doi.org/10.1016/j.foreco.2009.09.050",
-  textVersion = paste("Nuske, R.S., Sprauer, S. and Saborowski, J. (2009):",
-    "Adapting the pair-correlation function for analysing the spatial",
-    "distribution of canopy gaps. Forest Ecology and Management 259(1):",
-    "107–116. https://doi.org/10.1016/j.foreco.2009.09.050")
+  doi="https://doi.org/10.1016/j.foreco.2009.09.050"
 )