* orm: add tracing of the generated queries by the orm module, when a program is compiled with `-d trace_orm`
* examples: fix examples/database/orm.v, add comments, and ensure that the example can be run several times with no errors
The example demonstrates connecting to all 3 DBs in the same program, and will be added to the CI very soon,
to serve both as a regression test, if it fails, and as an example to how to use the ORM in combination with
raw SQL queries to the DBs (which are driver/wrapper specific, unlike the ORM, but can be more convenient in some situations).
vlib is the term for all modules included by default with V and
maintained as part of the V source code repository.
Some included modules depend on third party libraries, and these are kept
separate in the thirdparty directory at the root level of the source
repository.
db97630117