Usermanual update
Fix _dt_sigsegv_handler when PTRACE restrictions are active (yama)
Starting with Ubuntu 10.10, PTRACE is limited to only direct descendants.

It is controlled by /proc/sys/kernel/yama/ptrace_scope
* if it is 0, then it is not needed
* if it is 1, then this IS needed
* else there is nothing we can do (no bt will be made)

FIXME: do we need to make child wait until prctl returns in main process?

Based on:
https://bugs.kde.org/show_bug.cgi?id=245529
https://breakpad.appspot.com/166001
https://wiki.ubuntu.com/Security/Features#ptrace
Merge pull request #714 from VictorLamoine/master

French translation of the entire usermanual
Define PATH_MAX as 4096 in case it is undefined.
Might fix build on Debian GNU/Hurd (i386)

https://buildd.debian.org/status/fetch.php?pkg=darktable&arch=hurd-i386&ver=1.4.2-1&stamp=1399195932
Merge pull request #716 from LebedevRI/fix-sigsegv-handler-when-yama

Fix _dt_sigsegv_handler when PTRACE restrictions are active (yama)
wb_presets: SONY RX100M2 (thanks to Matthew Harrison)
Merge remote-tracking branch 'original/master'