Bug fixes

Various bug fixes.
Option to disable compression and work with subtotals rows instead.
Settings to apply classes to group columns and rows.
Code works now with raw values (where appropriate) instead of rendered values.
Solved problem with decimal and thousand separator.
Updated documentation in README.txt.

Better management of Map Reset Controller: avoid duplication on ajax Exposed filtered requests.
Better definition on Map Start state.

I'm seeing an uptick in usage without a corresponding increase in issues identified, so it seems we're ready for a stable release. There are a couple of lingering feature requests I was hoping to get closed off, but they're pretty close, and need additional input before they can be resolved, so no sense holding off.

#2984418 Fatal error: Can't use function return value in write context

#2984418 Fatal error: Can't use function return value in write context

Fixed issue reported at #3067296: InvalidArgumentException: Class "\Drupal\searchindex_wipe\Form\SearchIndexWipeConfirm" does not exist.
Fixed issue reported at #3012816: Namespace Dependencies in .info.yml