Fix umask bug and do a code cleanup of chmod/mkdir usage so set the correct...

Fix umask bug and do a code cleanup of chmod/mkdir usage so set the correct permissions, this should also fix problems with dokuwiki making setuid files on some umasks.

  * Don't set the umask() anymore, this is not good form and we don't really know what is it in the old code anyway as it was not done properly.
  * Retire the dmask config option introduce 2 new ones called fmode and dmode, this is more in line with posix and should make more sense.
  * Use chmod for setting the correct permissions but only if it's needed.
  * Set changing of permissions off by default as i should work properly in most Apache setups without and it does not make sense on windows anyway.

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