smartctl.8.in, smartd.8.in, smartd.conf.5.in: Fix usage of line breaks and empty lines.

git-svn-id: https://svn.code.sf.net/p/smartmontools/code/trunk/smartmontools@3965 4ea69e1a-61f1-4043-bf83-b5c94c648137
atacmds.cpp: Rework heuristics for 'tempminmax' format.
Now supports negative values (ticket #291) and WDC over temperature counter.

git-svn-id: https://svn.code.sf.net/p/smartmontools/code/trunk/smartmontools@3966 4ea69e1a-61f1-4043-bf83-b5c94c648137
atacmds.cpp: Change default for Head_Flying_Hours to 'raw24(raw8)'.
This provides more reasonable output for Seagate HDDs missing in drivedb.h.
drivedb.h: Comment new default for Head_Flying_Hours.

git-svn-id: https://svn.code.sf.net/p/smartmontools/code/trunk/smartmontools@3967 4ea69e1a-61f1-4043-bf83-b5c94c648137