This patch adds an utility script (readme2c.pl) which extracts the
SYNOPSIS and OPTIONS part of README.rst and puts it into C
strings. These are then used inside the SyncEvolution command line for
short help (just the synopsis) and --help (also all options).
This patch also cleans up README.rst so that the OPTIONS part really
documents most options in sufficient detail for --help to be useful.
The USAGE section remains part of the README and the man page where
the different operations are introduced in a more task-oriented way.
This separation is not always easy to make. The --restore operation
and related parameters are only described in the USAGE part because I
couldn't find a way to introduce them briefly and then add a thorough
explanation under OPTIONS.
