Fix bug in compare.c where obj_ref to pb_obj_ref

Fix bug in compare.c where obj_ref to pb_obj_ref

Added call to perl "config" method so the the
perl module can have its own configuration
options.

Fix bug in init.c where the address of the be_private
object was being retrieved when it was already
a pointer.

Added the dn parameter to the modify.c call to the
modify method.  Not sure why this wasn't there
in the beginning.

Expects and array from the search method instead of
a scalar in search.c so that it can return search
results and a return code.

Added the demo file SampleLDAP.pm