Reorganization and redesign of changelog v2.  Conversion scripts are now more modular.  A shell script drives the conversion process.
Removed DROP on non-existent index.
Fixed two joins from activity_details table to parent tables.
changelog v2 runtime triggers and reporting changes
Moved initial work on changelog v2 to Old/.
Added a bunch of --skip-XXXX options to offer fine-grained control over the conversion process.
Fix: improper matching for activities in detail trigger when user_id is NULL
Fixed parsing of entity_info
Fix: corrected key-based grouping in LoggingSummary->alterDisplay
Added change_ts to the summary table record insertion, so the proper timestamp from the original log record is saved.
Added indexes to log_civicrm_tag to speed up summary/detail conversion.
Default the group name to "Unknown Group (id=NN)" if a group cannot be matched during conversion.
Merge branch 'dev' into test