Add comment about cache improvement
Move compute_size_and_date.ml to engine ; SCM dependent functions go to Git
Update LOG messages
Report exception at top level
Add VersionRE in show_attr
Clean up Setup
Use Git SCM to retrieve information
Failsafe if public scm not set
Rename long named module
Use BOLT
Print backtrace in case of Exception
Fix get_size and get_tag
Use cache when possible, compute otherwise
Remove 'cd' when possible
Update log message and failwith
Remove obsolete comments
Merge cache after parsing
Merge branch 'preinit'