Add check for index and constraint name length

Extracted from old TODO

added trytond type::behavior + 1 deleted label

Indeed for PostgreSQL the limit is 64.
But probably the name of the constraint should be generated per the database backend.

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Indeed the limit is 63. I propose to use the hexdigest from sha256 and remove the last char.
The main issue is how to manage __raise_integrity_error. At some point the code is already not very safe by testing constraint name in the exception.

assigned to @ced

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Here is review37381003
I did not changed the table name, primary key nor sequence because they can be fixed if needed in the configuration file (and also it is better to keep their meaning).

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review37381003 updated at https://codereview.tryton.org/37381003/#ps1

review37381003 updated at https://codereview.tryton.org/37381003/#ps20001

New changeset ada310e4e733 by C?dric Krier in branch 'default':
Convert into hash too long data name
http://hg.tryton.org/trytond/rev/ada310e4e733

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closed

New changeset 4c039aa7e8c9 by C?dric Krier in branch '4.4':
Convert into hash too long data name
http://hg.tryton.org/trytond/rev/4c039aa7e8c9

mentioned in issue #6026 (closed)

mentioned in issue #6494 (closed)

mentioned in issue #6965 (closed)