Zfs-clone-manager

- Addded __main__.py for calling zcm as module (with python -m zcm)
- Added solaris packaging information

- Changed zfs_set(zfs_name,mounted=*) to zfs_[un]mount(zfs_name)
- Fix zfs not mounted after migration
- Changed shutil.copytree and shutil.copy2 to "cd source; tar cf - . | (cd target; tar xf -)" command
- Fixed "option not recongnized" bug in zfs/get_cmd()
- Library zfs* functions now raise ZFSError on error and returns stdout instead of returncode
- Added JSON output to commands clone and list

- Fix some copy paste issues with some strings

- Added new check in Manager.load()
- Added command diff
- Added pagination to print_table (and print commands)
- Added supress headers to print_table (and print commands)
- Added parameter to initialize command with migration
- Renamed Manager.initialize_zfs() to Manager.initialize_manager()

- Fix Manager.size uninitialized
- Removed loop for path detection in get_zcm_for_path()
- Removed ZFS property zfs_clone_manager:active.
Active detection going back to clone_zfs.mountpoint==root_zfs.zfs_clone_manager:path
- Renamed back create command to clone

- Moved parameter -p,--path as subcommand argument filesystem|path
- Changed subcommand name and aliases behavior
- Added zfs_clone_manager:path and zfs_clone_manager:active ZFS properties handling
- Renamed zfs property to name in Manager
- Better handling of on/off properties in zfs
- Added Clone class to use it instead of a dict
- Renamed name properties to zfs in Manager and Clone