CLEANUP: Bump requirement to R (>= 3.1.1) and drop NAMESPACE workarounds

[HenrikBengtsson]

Now (2015-04-16) when R 3.2.0 is out, bump requirement to R (>= 3.1.1). By choosing 3.1.1 (July 2014) and not 3.1.0 (April 2014), we can also replying BioC (>= 3.0) (October 2014). This is also what next release of R.filesets will do.

This allows us to drop the NAMESPACE workaround for the max. 500 S3 methods limitation in R (< 3.0.2), e.g.

if (getRversion() >= "3.1.0") {
  S3method("fixSearchPath", "AromaPackage")
  S3method("fixSearchPathInternal", "AromaPackage")
  S3method("patch", "AromaPackage")
}

This will also remove the (false) R CMD check NOTE:

* checking package namespace information ... NOTE
R < 3.0.2 had a limit of 500 registered S3 methods: found 841

[HenrikBengtsson]

Done in commit 955adf6.