Merge pull request #1 from jouvin/master

ncm-xrootd: add support for configuring log file retention
[maven-release-plugin] prepare release configuration-modules-grid-13.1-rc
[maven-release-plugin] prepare for next development iteration
[maven-release-plugin] prepare release configuration-modules-grid-13.1.0-rc3
[maven-release-plugin] prepare for next development iteration
[maven-release-plugin] prepare release configuration-modules-grid-13.1.0
[maven-release-plugin] prepare for next development iteration