delimit_string initial commit

svn path=/branches/filesystem3/boost/delimit_string.hpp; revision=63015
Fix all known issues, wishes

svn path=/branches/filesystem3/boost/delimit_string.hpp; revision=63017
Move header, provide all template parameters, clean up code

svn path=/branches/filesystem3/boost/delimit_string.hpp; revision=63042
Clean up code, add initial documentation draft

svn path=/branches/filesystem3/libs/filesystem/; revision=63082
Cope with I/O errors or premature eof

svn path=/branches/filesystem3/libs/filesystem/; revision=63099