don't use FALSE/TRUE: C99 has stdbool.h, use it.

don't use FALSE/TRUE: C99 has stdbool.h, use it.
use "slightly" more paranoid compilation flags to avoid more errors.

The makefile may need some tweaks to detect if $(CC) is gcc and if it's a
recent enough version.

fix compilation warnings:
 * missing static
 * #if 0 an unused function
 * add missing const.
 * add missing casts.

use <getopt.h> rather than custom definitions.

 Makefile      |    2 -
 mbox-helper.c |   83 +++++++++++++++++++++++++---------------------------------
 2 files changed, 38 insertions(+), 47 deletions(-)

git-svn-id: svn+ssh://murphy/home/svn/banana/trunk@210 9869982d-c50d-0410-be91-f2a2ec7c7c7b