Issue 237 monitor dir rename

[yarondbb]

Summary of solution for this branch: User flow:

1. Stop the application
2. Run Do manual changes in monitoring directories (any change)
3. Run the application with new flag: manual_file_change=true
4. Application should provide new content data file with the manual changes (without doing any indexing), and exit
5. Run application again with new flag: manual_file_change=false (default calue). Application will load the uchanged content data file and continue

Alogorithm for step 3: load content data with new flag: 'manual_file_change' During load the application will builld new map: file,size,mod --> [checksum, uniqu] If key found more then 1 time,then uniqu become false. This will indicate not to do anything with it during manual change

monitoring new behavior: existing files in Application Tree - ignore new found files in OS system: If not exist in map - need to be indexed. skip (will be handled in step 5. If exist in map (copied or moved): if uniqu is true - take the original checksum and add to ContentData if uniqu is false - need to be indexed. skip. will be handled in step 5. unmarked files (non existing) - will have legacy behavior and be remove from content data Write new content data to file Exit the application

[bbfsdev]

Good job!

[yarondbb]

@kolmanv, note that Genady already reviewd file: lib/content_data/content_data.rb (in issue #243). I merged 243 branch to this branch, since 'adding index time' feature is also part of this feature (monitoring manual changes)