Fix I0 of some transformers in the catalogue (#449)

The no-load currents (I0) of some of the most recent transformers in the
catalogue were off by a factor of 100. The values in the manufacturers
catalogue are in % while the values we save are in pu. This PR fixes
these currents for affected transformers.

Note that this considerably improves the reactive power losses in these
transformers, up to a factor of 2 when the transformer is fully loaded.

Author: alihamdan

doc/Changelog.md

@@ -21,6 +21,7 @@ og:description: See what's new in the latest release of Roseau Load Flow !
 
 ## Unreleased
 
+- {gh-pr}`449` Fix wrong unit of no-load current of some transformers in the catalogue.
 - {gh-pr}`447` Fix serialization to JSON when the `Switch` constructor gets a numpy bool as the `closed` argument.
 - {gh-pr}`440` Add switch `closed` status to the network's switches dataframe and graph representation.
 - {gh-pr}`439` Fix repr string of `rlf.GroundConnection`