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.
