New SQL schema changes have been introduced to EntropyRepository,
keeping them disabled by default (older Entropy client have to be
flushed out first). The aim is to improve performance avoiding
extra SQL joins on baseinfo and extrainfo tables, thus removing
"categories", "flags", "licenses" tables (which missed external
keys also).
This upgrade is completely backward compatible and new schema is detected
at runtime, so the whole class can work with old and new one transparently.
The downside is that listPackageIdsInCategoryId() is no longer available and
has been replaced by a more generic listPackageIdsInCategory().
This new SQL schema will be hopefully enabled before the end of 2011.
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