Make checking top-level files support .install_timestamp.

git-svn-id: https://svn.r-project.org/R/trunk@63653 00db46b3-68df-0310-9c12-caf00c1e9a41
Suppress ::: notes for packages with the same maintainer.

git-svn-id: https://svn.r-project.org/R/trunk@63654 00db46b3-68df-0310-9c12-caf00c1e9a41
lgamma(-<very small>)

git-svn-id: https://svn.r-project.org/R/trunk@63655 00db46b3-68df-0310-9c12-caf00c1e9a41
do report on ::: to self

git-svn-id: https://svn.r-project.org/R/trunk@63657 00db46b3-68df-0310-9c12-caf00c1e9a41