[source] update system table and internal structures on source renaming. Closes #1896721

[rql2sql] closes #1892473: enhance handling of optional inlined relation * some outer join aren't supported while they could * consider newly available 'optcomparisons' st information on variables (rql 0.30)

[schema] use definition for `use_email` relation instead of type declaration (closes: #1894929) This will be more adaptable for other existent `use_relastion` as the one in the cube Person.

[web] rql directive breaks if explicit vid and empty rset (closes #1893433)

[datafeed] properly encode/decode external uri

[querier] we should not insert None but skip the line when some unknown eid is detected (closes #1892491)

[rql2sql] closes #1892471: support for unary expression introduced in rql 0.30

[deprecation] __message hidden generate deprecation warning

[server] host mapping is better named url mapping (closes #1892461)

[packaging] should depend on yams 0.33

[packaging] should depend on yams 0.33

[rql2sql test] sqlserver use 0/1 for booleans, not FALSE/TRUE

[repo] Stop setting hashmode on schema At best it was a no-op, at worst it created race conditions.

[devtool] Make the sqlite database used for test execution process specific (closes #1230401) * Database cache are not impacted. * This allow multiple process to run test with the same template at the same time The db-name property return an unaltered value to for database cache mechanism.

backport stable