merge 3.17.16 into 3.18 branch

Remove uses of logilab.common.compat.{all,any} They're just aliases to the builtin ones on python 2.5+. If anyone needs convincing: >>> from logilab.common import compat >>> compat.any <built-in function any> >>> compat.all <built-in function all>

remove references to global environment variable APYCOT_ROOT

Add warning messages when enabling remote pickle-based repository access Warn when starting a pyro or zmq-only repo, or when one of these access methods is enabled. Closes #2919295

[web] Fix expiry of anonymous sessions (closes #4154479) Things like: try: foo except: bar else: baz doesn't work very well if you expect baz to run even in the exception case. Plus, session.cnx.check() is a dbapi remnant, so drop it and just look at session.mtime.

[hooks/syncschema] avoid altering a dropped table If the constraint's rdef is being removed, CWConstraintDelOp doesn't need to do anything. Otherwise it may try to alter a removed table/column. Closes #4154549

[js] fix name error

[devtools] improve error message when postgresql tools are missing By default in at least Debian, some pg tools are not present in the PATH. Or they may not be installed. But the tests tools expects them to be in the PATH, and give an unhelpful 'No such file or directory' backtrace if they're not found. To help devs using the pg tests we improve the error message.

[server] Replace non portable strftime formatter (closes #4132161)

[web/request] use a picklable Counter object for tab index counters Related to #1381328.