DPL: get CCDB and reader signposts to work.

[ktf]

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[ktf]

@ehellbar this will allow you to hook into the ccdb signpost. The issue was that since the signpost itself was in a plugin, it was not there when the enableSignposts ran. For now I will simply predeclare it so that the framework knows about it. A proper fix would be to either have a hook when a new plugin is loaded.

[ktf]

Compiles, not tested. Tested locally on my mac. Merging.

[ehellbar]

@ktf thanks!