Excel Importer

[Zoophobus]

Hello all!

When using the activity browser an issue has come up when importing excel databases. In windows this error manifests itself as a peewee error, while in GNU/Linux pointer and segmentation errors are common although not consistently so.

This issue is duplicated in the activity browser and more details can be found there.
LCA-ActivityBrowser/activity-browser#858 (comment)

A typical Linux error message is as follows:
Applying strategy: hash_parameter_group Applying strategy: convert_activity_parameters_to_list Applied 19 strategies in 16.90 seconds Could not link exchanges, here are 10 examples.: [{'amount': 0.00262, 'database': 'super_ei38_REMIND_el_20220923', free(): invalid pointer