Log Message:
Update math/grace to 5.1.25.
Change bl3 to pdflib-lite to fix binary package distribution.

Grace-5.1.25
- killing set data from GUI and scripts now clears set comments
- undid "always overwrite set comments when reading data in" from 5.1.24
- fixed Fourier transform DC-term amplitude (rep. #630)
- newer versions of "make" tried to regenerate documentation (rep. #2240)

Grace-5.1.24
- fixed detection of dynamic loading libraries (rep. # 2238)
- install PDF docs instead of the DVI ones
- added cephes/COPYING (from Debian)
- a workaround for broken input of non-ASCII text under UTF8 locales
- always overwrite set comments when reading data in