initial import into CVS. There was much rejoicing.
* 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