added function to return file header to both the C library
and the perl interface.
Added compression both reading and writing
	modified:   matio-1.5.0/src/mat.c
	modified:   matlab.pd
removed POD coverage tests. these fail. I notified upstream
printf format types now use 'z' when printing size_t data
PDL::IO::Matlab now works with PDL >= 2.007

PDL 2.007 introduced a new type used for dimension sizes. This patch uses that
new type. This is a required change to work with newer PDLs. This patch does NOT
preserve backwards compatibility with older PDLs.