[wsgi] avoid reading the entire request body in memory Import POST form handling code from https://raw.github.com/defnull/multipart/master/multipart.py to avoid reading arbitrary amounts of data from the network in memory. NOTES: - In the twisted case we limit the max request content-length to 100MB (by default), which seems kind of arbitrary, but avoids this issue - werkzeug.formparser has suitable code as well, but I don't know if we want to add it as a dependency

Added tag cubicweb-version-3.17.15, cubicweb-debian-version-3.17.15-1, cubicweb-centos-version-3.17.15-1 for changeset ee413076752b

[pkg] also bump __pkginfo__

[pkg] prepare 3.17.15

[cache] fix a cache issue with an entity created without relation cache prefill Prefilling the relation cache has its benefits sometimes, but for massive imports it may be a memory hog. The caches should be kept coherent even if there was no prefill. Closes #3828155.

[web/test] add a test for some http response codes Related to #3648809

[views] remove reference to the MAPPING_CHECKERS dict (closes #3810219) Was removed by by the changeset 65d93a4fd11c ([multi-sources-removal] Drop pyrorql and zmqrql sources)

[web/ajax] Always return a json dict with a 'reason' key in case of ajax errors Sending sometimes a bare unicode string and sometimes a json-encoded dict seems like a bad idea.