[vdr] [RFC] Shutdown rewrite for 1.5.x, final

[Udo Richter]

Hi list,

Now that VDR 1.5.1 was published, I've also published the final 1.0 
version of the shutdown rewrite. The changes since 0.4 are mainly by Klaus.

http://www.udo-richter.de/vdr/patches.html#shutdown
http://www.udo-richter.de/vdr/patches.en.html#shutdown

The patch is identical to the changes of VDR 1.5.1, except that no 
functions were dropped, for compatibility. Also, the detection define is 
present, and should be used like this:

#if VDRVERSNUM >= 10501 || (defined(PATCH_SHUTDOWN_REWRITE) && 
PATCH_SHUTDOWN_REWRITE >= 100)
...
#else
...
#endif


Changes:
- Identifiers changed:
   cShutdown -> cShutdownHandler
   Shutdown -> ShutdownHandler

- cRemote::LastActivity() now returns an absolute time, not a relative!

- Dropped cThread::EmergencyExit (still present in this patch for
   compatibility)

- Rearranged signal handling, report all signals instantly to syslog

- ISREALKEY macro to check whether a key is user-generated

- Some new timeout constants in vdr.c

- Updated man page regarding SIGHUP

- Coding style rewrite by Klaus, slight changes in documentation,
   comments and i18n strings

Cheers,

Udo