gst/base/gstbasetransform.c: use gboolean return values and pointers to size so we can use the full GST_BUFFER_SIZE r...

Original commit message from CVS:
* gst/base/gstbasetransform.c: (gst_base_transform_transform_caps),
(gst_base_transform_transform_size), (gst_base_transform_getcaps),
(gst_base_transform_setcaps), (gst_base_transform_get_unit_size),
(gst_base_transform_buffer_alloc),
(gst_base_transform_handle_buffer):
use gboolean return values and pointers to size so we can use the
full GST_BUFFER_SIZE range (guint) for buffer sizes
use GstPadDirection for transform_caps
* gst/base/gstbasetransform.h:
rename get_size to get_unit_size since that's what it is
* gst/elements/gstcapsfilter.c: (gst_capsfilter_transform_caps):
use GstPadDirection for transform_caps
* gst/gstbuffer.c: (gst_buffer_new_and_alloc):
* gst/gstutils.h:
cleanup and debugging