getting perl wrapper up to speed

also some small improvments to xdireader.c + squenlched a compilation warning in xdifile
tool to install file magic on a unix system
fix baddata test for perl wrapper

fix a few issues withlibxdifile
make windows icon for xdi fles
address issue of text after colon in user comments
fix bug in xdifile.c where last point was dropped from data table

have xdireader report bottom of data table
perl wrapper now passes all tests
Merge pull request #27 from bruceravel/master

fixed several bugs in libxdifile + completed perl wrapper