[db-api/configuration] simplify db-api and configuration so that all the connection information is in the repository url, closes #2521848 eg no more specific option of pyro ns host, group, etc. This also fixes broken ZMQ sources. Changes: * dropped pyro-ns-host, pyro-instance-id, pyro-ns-group from client side config, in favor of repository-uri. No migration done, supposing there is **no web-only config** in the wild. Also stop discovering the connection method through the repo_method class attribute of the configuration, varying according to the configuration class. This is a first step on the way to a simpler configuration handling. Notice those pyro options are still available for repository only / all-in-one configurations as they are needed to configure the pyro server. * stop telling connection method using ConnectionProperties, this is so boring. Also, drop _cnxtype from Connection and cnxtype from Session. The former is replaced by a is_repo_in_memory property and the later is totaly useless. * deprecate in_memory_cnx which becomes useless, use _repo_connect instead

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try:

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    rtype, = __args__

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except ValueError:

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    print 'USAGE: cubicweb-ctl shell <instance> detect_cycle.py -- <relation type>'

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    print

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graph = {}

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for fromeid, toeid in rql('Any X,Y WHERE X %s Y' % rtype):

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    graph.setdefault(fromeid, []).append(toeid)

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from logilab.common.graph import get_cycles

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for cycle in get_cycles(graph):

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    print 'cycle', '->'.join(str(n) for n in cycle)