it was like pulling on a thread in a sweater: the changes just kept rolling
into each other...
* don't load all the keys at start, just cache them as they are requested
* use GpgContext::key to get the key for us rather than looping through all keys
* fix SignedBy so it doesn't say a key is signed by every other key(!)
* FullTrus*t*ed
155b5bd879