This patch merges CEPs (aka Checkbox Enhancement Proposals) into trunk. Those lived on separately for a while as lp:checkbox/cep but in retrospective nobody knows about them and this should give them some more exposure. In addition, the move allows new features to land a CEP document along, making review of complex new features easier to make as their specification can be seen alongside the patches that implement it.
Due to bazaar limitations in merging separate repositories together I've discarded history entries (not that there were many) and just added those files in directly.
Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@canonical.com>