Add TSMeta.counterExistsInStorage() to determine if the counter exists

Signed-off-by: Chris Larsen <clarsen@euphoriaaudio.com>
Add uid metasync CLI command to generate meta data from existing data for use
in upgrading to 2.0. The command also updates the "created" timestamp and
attempts to fix corrupted meta data

Signed-off-by: Chris Larsen <clarsen@euphoriaaudio.com>