Show number of errors separately, don't override status if there are a non-zero
number of errors - this was unhelpful if we've managed to resume after errors.
Consolidate the two nasal sections into one (only one nasal section would be used).
Make controls work properly and accurately reflect status.
Remove OK and Apply as enable/disable takes effect immediately.
Comment out unsupported "Download other data files" checkbox.
Revised logic of AI Traffic to reflect status; added button to force update (normally AI Traffic update is only performed during startup)
Now tile refresh is gone, this dialog is much simpler.
(Scenery can still be reloaded from the Rendering dialog or sim reset,
but the pager will always wait on TerraSync)
- Change from a directory selection dialog to a combo list of valid directories
- Only allow directories in fg-scenery to be selected
- Don't allow FG_ROOT/Scenery to be selected (interferes badly)
- Only allow terrasync to be enabled once a directory has been defined.
