add option --skipone that behaves like --skip but only for a single package
Submitted by Sascha Silbe
Link to original bug (#616661)
Description
Please add an option --skipone (to build and update) that skips only the packages themselves, but not their dependencies.
Background: I hack on a few of the modules in sugar-jhbuild myself and don't want it to mess with the state of those (i.e. not run pull or rebase) when I update all the others. When using --skip, all dependencies of the skipped packages will not get updated which isn't what I want.