Branch for aix shared linking support

svn path=/branches/aix_so/boost/tools/build/; revision=13704
aix-shared

svn path=/branches/aix_so/boost/tools/build/; revision=13706
Another shot at AIX shared objects

svn path=/branches/aix_so/boost/tools/build/; revision=13719
a comment + certainty for linkflag ordering

svn path=/branches/aix_so/boost/tools/build/; revision=13722
AIX compatibility fixes.

svn path=/branches/aix_so/boost/tools/build/; revision=13724
use LIBPATH instead of LD_LIBRARY_PATH on AIX

svn path=/branches/aix_so/boost/tools/build/; revision=13726
skip symbols that are too long.

svn path=/branches/aix_so/boost/tools/build/; revision=13845