2010/11/22:
 * Finished implementing input from and output to versions 3.11.2 and 3.12.0
    for all usual binary object files (ast, .cmi, .cmo, .cmx, .cma, .cmxa)
 * New options:
    -vers VERSION: output to binary format of version VERSION
    -vers help: print all available versions
    -vers current: output to current binary format (default)

2010/11/20:
 * New module parsing/bincompat.ml
 * Implemented ast, cmi, cmo, cma output to versions 3.11.2 and 3.12.0
    * Unimplemented features raise Bincompat.No_Such_Feature (version, feature)
 * Implemented ast input from camlp4 for 3.12.0 and 3.11.2. Not yet tested.
 * Added interface files

2010/11/19:
 * Started implementing AST input (for camlp4)

2010/11/18:
 * New subdirectory compat/ with subdirectories 3.12.0 and 3.11.2
 * New module typing/cmi_format.ml
 * Able to load .cmi/.cmo/.cmx/.cma/.cmxa from versions 3.12.0 and 3.11.2

2010/11/18: created branch from trunk r10817


