When .tdb and .ddb templates don't match, Timelapse should ask the user to resolve the differences

[saulgreenberg]

Some cases:

• both match except there is a new column in the template .tdb
• both match except there is a deleted column in the template .tdb
• columns added / deleted in both, which may also be a renamed column

[saulgreenberg]

Resolved, Timelapse now handles various template changes:

• Added/deleted/renamed controls / data fields are now allowed
• deletion of choice menu items produces a warning
• control whose type is changed produces a sync error and doesn't allow the user to continue