rrdtool 1.3.7 released - segfault fixed, hw performance enhanced

RRDtool 1.3.7 released
----------------------

The new release contains some rather influential changes.

* Holt-Winters rrds should see a drastic speedup.
* Front-ends relying on output from graph --lazy will work again
* updatev does not segfault on 32 bit platforms anymore.
* rrd_dump produces correct output with german locales.

As usual, you can get the update from

  http://oss.oetiker.ch/rrdtool/

Detailed changes for 1.3.7
--------------------------

Bugfixes:

- fixed sprintf segmentation fault in updatev function for all
  architectures where sizeof(time_t) == 32

- removed all instances of rrd_flush from the holt winters code
  resulting in a massive performance gain for holt winters updates.
  rrd_flush was a left-over from the time when rrdtool IO was
  stream based. Even worse, the old fflush had been converted to
  fsync which was plain wrong.

- fixed rrd_xport output which included some stray debug output.