Add additional critical section to the default tickless implementations.
Update version number for maintenance release.

git-svn-id: https://freertos.svn.sourceforge.net/svnroot/freertos/trunk@1998 1d2547de-c912-0410-9cb9-b8ca96c0e9e2
Update version numbers.

git-svn-id: https://freertos.svn.sourceforge.net/svnroot/freertos/trunk@2000 1d2547de-c912-0410-9cb9-b8ca96c0e9e2
Merge remote-tracking branch 'trunk'