[convert]conversion with default values

[Oliver Heger]

I created a patch in bugzilla (bug ID 27639) that implements a 
conversion that supports default values if either null values are to be 
converted or a conversion causes an exception. This conversion and its 
corresonding conversion factory are implemented as decorators so they 
can be attached to arbitrary other conversions.

To get a better understanding for the convert2 codebase I tried to write 
a simple Object to Integer conversion. I ended up with a base class for 
conversions from Object to arbitrary types, which should simplify 
construction of concrete conversions and their factories. I think now I 
understand what you meant by "support of inheritence without bothering 
the registry". These base classes and the Object to Integer conversion 
classes are also in the patch file. I hope this is useful.

Oliver

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