Removed unneeded files, added option

Using ITK's doxygen tags file can be enabled or disabled with
the USE_ITK_DOXYGEN_TAGS option.  By default it is enabled.
Doxygen can take a long time, if this option is enabled, especially
if an older version of doxygen is used.

Change-Id: Idf0794d6227acd55d7f8c95c11a13d42bf601eb2
Improving style and comment messages

Change-Id: Ia28d8da056b39294ca136ad8f6691b844206d4ba
Merge topic 'ITKDoxygenTags' into next

5fe23591 Improving style and comment messages
227dabb4 Removed unneeded files, added option