OMakefile: reorganize the building of packages
New module: Extstream
Cpsllvm: new function: from_stream
OMakefile: add support for Extstream
Cps: remove wrapper
Test_cpsconvertclosures: do not use Cps wrapper anymore
Log: add new debug categories
Cpsllvm: Use Base instead of Cpsbase everywhere
Cpstransform: new module
Compilation_passes: new module
Main: new module
src/OMakefile: update to compile main
Merge remote-tracking branch 'refs/remotes/origin/master'
OMakefile: now uses ocamlfind