[serverctl] complete the schema-diff command with options that will fix & enhance it. Notably: - filter out eids (doesn't make sense for the filesystem schema) - handle permissions, trying to detect the default ones Needs yams #174042. Closes #2996547.

[server] deprecate the old multi-source system It is removed in 3.19. Closes #2919299

[doc] document changed attribute default value storage

defaultval migration for sqlite

[schema] store default attribute values in a Bytes field, allowing python objects as default values Notes: * Binary objects grow two methods * we depend on a newer yams version * the code is quite simplified as a result of the whole change * a very old and nasty bug where bool(default values) evaluating to False not being properly migrated is killed Closes #2414591.

[source/native] fix sqlserver pattern matcher for unique constraints (closes #3227593) The matcher is used to parse the low-level error message and extract meaningful information for the end users. If broken, the users see an alarming and bewildering message. A full & definitive fix is scheduled for CubicWeb 3.18.

[dbapi] Fix broken inmemory:// URLs parsing (closes #3225832) ParseResult.path is what comes after the "domain name" in standard URLs. So in the case of 'inmemory://<instance' URLs, it is always empty. ParseResult.netloc contains the "domain name" part that we really want.

[metadata hook] rename an operation for the sake of readability

[book] Typo fix and rephrasing in devrepo/migration

[cwshell] rename history file to .cwshell_history (erudi is dead, long live cw)