bug fixes and workarounds:

- partially fix c-z freeze mcc even after SIGCONT
  this also make mcc more robust to programs that crash
- explain to PO translators the importance of both
  translating _Options and Options
- mcc was not robust when embeded prog crash (kind of deadlock):
  now, we send ourselves USR1 on child reaping

code simplification:
- consolidate pixbufs
- s/Gtk->main_iteration while Gtk->events_pending/gtkflush/
- make some code more readable
- clean code through ugtk::create_factory_menu usage
- some perl_checker fixes
- test DISPLAY: if we don't have access to X server, switch to console version
- simplify config managment
- remove dummy timer
- s/if (!/unless/
- explain signal handlers goal
- simplify and make explanations frame managment more robust:
  * only start logdrake once
  * only create explanation frame once
  * just hide or show it depending on context
    (resulting in faster redisplay)

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