Makefile.am cleanup (removal of ChangeLog and Makefile.in files)

Makefile.am cleanup (removal of ChangeLog and Makefile.in files)

Details on this commit:
* Now that we are no longer storing machine generated ChangeLogs inside
  the git repository, make maintainer-clean should remove the machine
  generated ChangeLogs.  This way nobody accidently edits the ChangeLog.
  Only 7 ChangeLogs are left after a make maintainer-clean (intl, po,
  and one toplevel ChangeLog).
* Some directories were missing the removal of Makefile.in when make
  maintainer-clean is run.  Only 3 Makefile.in files remain now after
  make maintainer-clean (only in the intl directories).
* Removed $Id$ tags from some of the Makefiles since we are no longer
  using CVS.
* Removed some unnecessary ChangeLogs from ever being created (from
  example/gTAG gschem/scripts, and symbol/font).

Note 1: There are still some machine generated files still hanging around,
but I'm going to leave those alone for now as the .gitignore mechanism
properly masks those.

Note 2: Made sure that all files that are to be removed in the *CLEANFILES
lists comes before the #*# otherwise they will be ignored.