* common-src/conffile.c: Deprecate usetimestamps, it is always "yes"
* example/amanda.conf.in: Remove usetimestamps.
* example/template.d/advanced.conf.in: Remove usetimestamps.
* man/xml-source/amanda.conf.5.xml: Deprecate usetimestamps.
* server-src/logfile.c (make_logname, get_logname, set_logname) New
  function.
* server-src/logfile.h (make_logname, get_logname, set_logname) Add
  prototype.
* perl/Amanda/Logfile.swg (make_logname, get_logname, set_logname) Add
  function.
* server-src/amdump.pl, server-src/amflush.c, server-src/amvault.pl:
  Create a log.<datastamps>.0 file and use it. Do not check for a
  'log' file.
* server-src/amcheck.c: Do not check for a 'log' file.
* server-src/driverio.c: Pass --log-filename argument to sub process.
* server-src/driverio.h: add log_filename variable.
* server-src/chunker.pl, server-src/driver.c,
  server-src/dumper.c, server-src/planner.c,
  server-src/taper.pl: Use logfile from --log-filename argument.
* installcheck/Amanda_Config.pl, installcheck/Amanda_Logfile.pl,
  installcheck/amdump.pl, installcheck/chunker.pl,
  installcheck/taper.pl: Fix.


git-svn-id: https://amanda.svn.sourceforge.net/svnroot/amanda/amanda/trunk@5141 a8d146d6-cc15-0410-8900-af154a0219e0