[boost] bcp update #2: namespace renaming

OK, since folks keep asking for it, bcp will now do namespace renaming, the two new options are: --namespace=newname Renames namespace boost to "newname" in all the source files copied. Also changes library names to start with the prefix "newname" or "libnewname" rather than "boost" or "libboost". --namespace-alias Makes namespace boost an alias for the new name. Using these two options you can get "strong versioning" with two different boost installs coexisting side by side (in the same application if necessary). What you can not do at present, is #include two different boost versions in the same translation unit. This update is in, and tested against, SVN Trunk only at present. Enjoy, John.