Abstract improvement

[achempion]

Please, consider improving abstract to more closely follow accepted structure.

Right now it contains many terms without proper introduction (such as "signer", "target id", "optional invoice" and so on).

Abstract should be concise as much as possible without unnecessary complications.

[homakov]

This wiki isn't academic, but I see what you mean. I should rename abstract to "overview"

[achempion]

Community would benefit from abstract (or just a short concise introduction). Right now it takes too much effort just to make a grasp understanding what it is all about.