Parser: Add some {} in the doc to avoid HeVeA to choke on them
Parser: fix bug in AST elaboration (wrong order of definitions)
Extlist: add functions subst and map_filter
Union_find: update comment
Cpsbase: Change order of with type to make OCaml 4.01 happy.
[OMakefile] Fix compilation for LLVM 3.5
Extstream: new functions