[Dcmlib] std::map vs std::hash_map

[Mathieu Malaterre]

Ok guys,

	I did perform a few bench comparing in Release mode on linux debian, 
gcc 3.3. If I replace the TagKeyHT from a std::map to a 
std::hash_table.. I only get a ~5% improvement. But again to reach 5% 
improvement I was parsing (see TestAllPrint.cxx) all files from gdcmData 
and all files from gdcmSampleData (rsync serveur). Basically the 
difference between a map and a hash is extremely negligeable. You only 
notice it when you parse a lot of file and a lot of tags...

	Since this is not exactly what I expected I'll differ the merge with my 
local change until I found a more drastic change that affect the speed 
of gdcm.

	Unless of course people are interested in the patch right away...

-----------------------------

	My machine: CHIRON, which used to do the win32 part (bcc32, and vs7.1) 
died last week (I am guessing the power supply), so it will only be back 
middle of next week.


Mathieu