This commit is the first in a series that will make the fsm apt to build the log.
The log (or journal) records events chronologically from the start to the end of the programme. Its quantitatively most important part is to report on the execution of the session.
The log will be created from the fsm (finite state machine) which describes all the possible states of the Gem-graph client and all the transitions between them.
The fsm header is introduced in this commit.
It lists the structures, functions and tools that the log will need and details the presentation of events in the log [date - rank - source file - source function - value].
The src/readme.docs file provides an initial overview of the missions and their distribution in the code files.
