A complete yet small extension for OCaml standard library

The purpose of this library is to add new functions to OCaml standard library modules, to modify some functions in order to get better performances or safety (tail-recursive) and also to provide new modules which should be useful for day to day programming.

Current goal is to maintain compatibility, new software is encouraged to not use extlib since stdlib is now seeing many additions and improvements which make many parts of extlib obsolete. For tail-recursion safety consider using other libraries e.g. containers.