Add Applying a Patch section to website

[hturner]

Another important workflow: applying an existing patch for testing. We could create an example patch based on askYesNo, so it is likely to work for any R-devel version. Perhaps add to the patches directory c.f. #39.

1. Update the svn checkout.

cd $TOP_SRCDIR
svn update

2. Revert any local changes (copy any changed files you want to keep elsewhere!)

svn revert -R . # revert any local changes

3. Apply the patch

svn patch $PATCHDIR/example.patch

4. Re-build R (ref Ad Updating R-devel section to website #40).

[hturner]

Looks like we somehow added this and removed it again, so reopening issue.