Branch for 2nd try at V2 removal

svn path=/branches/filesystem-v3a/doc/; revision=77497
Delete boost/filesystem/*.hpp

svn path=; revision=77498
Move boost/filesystem/v3/*.hpp to boost/filesystem

svn path=; revision=77499
Abandoned when it became obvious that removing filesystem V2 from trunk (as a series of three commits) was much easier and safer wrt history than pursuing a single commit solution.

svn path=; revision=77584