ENH: * Huge cleanup:

ENH: * Huge cleanup:
     - Remove printf / sprintf
     - include iostream AFTER gdcm so we don't get warnings
     - GDCM_NO_ANSI_STRING_STREAM shouldn't be used explitely ouside of gdcm source
     - Also remove tons of include from header files, hopefully this should speeup the compilation time, since it was becoming a dog slow.
     - Remove gdcm.h as it include way too many files and slow down compilation (plus it is not up to date)
     - remove /using namespace std/ this is BAD