Fix release version number.

Revert "bump x.y.z version to odd y following creation of RELEASE_3_1…

…3 branch"

This reverts commit 2e8360d.

bump x.y.z version to even y prior to creation of RELEASE_3_12 branch

bump x.y.z version to even y prior to creation of RELEASE_3_11 branch

Fix version for BioC release update

bump x.y.z version to even y prior to creation of RELEASE_3_10 branch

removePrimers bug fixes and version bump to 1.12.1

bump x.y.z versions to even y prior to creation of RELEASE_3_8 branch

bump x.y.z versions to even y prior to creation of RELEASE_3_7 branch

bump x.y.z versions to even y prior to creation of RELEASE_3_6 branch