[boost] [icl] doc filenames

Just noticed while doing an update that the documentation filenames for the ICL library are *very* long, and certainly won't pass our inspection script tests (although apparently these have stopped being run :-( ). Assuming that this is quickbook generated docs, the trick is to give each section an ID rather than rely on the auto-generated ones, for example: [section:foo Some long title that generates a really long file name...] Just a quick heads up, John.