Fix missing data objects in scrData

[romunov]

User Stéphanie Périquet reported a bug via the mailing list

library(SCRbayes)
data(lions)

dimnames(captures.lions)<-
   list(1:nrow(captures.lions),c("trapid","individual","occasion"))

lion.scrdata <- scrData(traps.lions,captures.lions,statespace.lions)

This PR addresses this issue by making sure not only session is created in case captures argument only has three columns.

Mass change in DESCRIPTION is due to my (Fedora) system changing line ends with something different than what you have (assuming Windows' LF, see core.autocrlf). And I just wanted to pump bugfix number... :)