:: implement developer-repo mode (aimed to developers who want to
test stuff and can download the whole packages repository db).
This results in 100% download size reduction for 99% of other users.
:: new "light" database versions now ship without packagechangelogs
table content to improve speed, download time and size.
:: cleanup entropy.client.interfaces.repository code and add support
for developer-repo feature
:: add warnings for users running "equo query changelog" without
developer-repo mode enabled
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