Merge pull request #1 from dpshelio/SOTMap

Patches on the database so it fixes SOTMap PR
The little patch on the database to avoid the insertion of two HDUs in
a entry when reading Hinode/SOT file has been removed. We (Stuart and I)
have decided to filter this to avoid future filterings and loose the
control on the code in the future.
To avoid confussion, a small note pointing to the origin of this extra
HDU will be added in the guide.

http://listmgr.cv.nrao.edu/pipermail/fitsbits/2007-August/001923.html
added link on why there are 2 HDUs in the databse for Hinode/SOT