[entity/optimization] Cache rset when entity.related is called with entities=False
If fail to see why we couldn't cache in this case, while this is important for
optimization reason: when doing a single HTTP request, some queries are done two
or three times because of predicates / uicfg or alike.
Also always store tuple and not list in the cache, because:
* else we get some regression
* and inconsistent result type (tuple or list)
* and it simply feels better to cache an unmutable object.
[MASTER]
load-plugins=cubicweb.pylintext
ignore=__pkginfo__
[MESSAGES CONTROL]
disable = too-many-ancestors,too-many-instance-attributes,too-many-public-methods,
too-few-public-methods,too-many-arguments,import-error
[BASIC]
function-rgx = [a-z_][a-z0-9_]{2,35}$
good-names=w,_
[TYPECHECK]
generated-members=debug,info,notice,warning,error,critical,exception
[CLASSES]
exclude-protected=_cw,_cnx,
# namedtuple public API.
_asdict,_fields,_replace,_source,_make
[FORMAT]
max-line-length=100
max-module-lines=2000