* Improved: Reliability when importing large CSVs
- Import requests will be automatically re-attempted if they fail
- Memory usage is improved, which should help for sites on shared hosting
* Fixed: Import error message not properly displayed
* Fixed: When the import was interrupted, the last record would not have its status set to 'processed', so resuming the import would start from the next record.
* Added: Button to unmap all fields with a single click
* Improved: Allow importing checkbox field data from a single CSV column
* Fixed: Import would break if a form had submit button conditional logic enabled
* Fixed: Date in "YYYY-MM-DD hh:mm:ss" format not being recognized as valid
* Fixed: Empty Entry Notes objects not being recognized as valid
* Fixed: When updating entries, they become unapproved (and other entry meta details cleared)
* Fixed: Empty Signature field values were not properly handled
* Fixed: Duplicated successful import message
* Fixed: Fatal error possible when activating a development version of Import Entries
