* plug-ins/common/poppler.c: initial import into CVS.  There was much
	rejoicing.

 	* configure.in: check for gthread-2.0 in the poppler check, because
	it is not necessarily checked for elsewhere.  Once other threaded
	plugins become available, this probably should be moved.

	Also removed the HAVE_POPPLER am conditional; it wasn't needed.

	* plug-ins/common/Makefile.am: added poppler to the build process