Removed some leaking deprecation warning in the Form component

Fixes #7101
merged branch stof/hide_deprecation (PR #7114)

This PR was submitted for the master branch but it was merged into the 2.2 branch instead (closes #7114).

Commits
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4680d87 Removed some leaking deprecation warning in the Form component

Discussion
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Removed some leaking deprecation warning in the Form component

| Q             | A
| ------------- | ---
| Fixed tickets | #7101
| License       | MIT

I have removed the error handler in the integration test case so that the testsuite can show any leaked deprecation message from the core and replaced deprecated methods in the type testcases.
This keeps only 2 cases where the handlign was needed: the test ensuring the BC for ``property_path``, and the code triggering #7101 because of its BC call

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by stof at 2013-02-18T22:41:56Z

hmm, wrong target. My branch is actually based on the 2.2 branch. @fabpot is it good for you or should I reopen it to the appropriate branch ?