allow to continue with -F if it failed yet do not attempt to
perform anything on the device itself. That way, -tF could be
specified for programmers like the STK500/STK600 even without a
device connected, just in order to allow changing parameters on
the programmer itself.
* avrdude.1: Document that possible use of the -F option.
* doc/avrdude.texi: (Ditto.)
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk@779 81a1dc3b-b13d-400b-aceb-764788c761c2