- new targets for libCGAL.a, libCGAL.so, libCGAL.so.*
- fix rules when SOVERSION is empty (use GNU/make idioms)
- Additional vpath in src/CGALQt/makefile, so that one can build it directly
from a checkout of the trunk.
- fix the build of libCGALBenchmark.
- fix the bison special stuff, so that we no longer rely on the expr and
the $(shell) function of GNU/make.