Ignore GetBuffer methods for most wrapped languages.

Change-Id: I5e8307942fc03a028efded24882af3594774b597
For Python add support for long index types.

The return type for certain index and point operations may return a
long integer type in Python. This get/set item methods must accept
this as input. Additionally, this type has been removed from Python 3,
to that needs to be a special case.

Change-Id: I59d30ef0692a00585e78d0d2f4cb774325d0dc1b
Merge topic 'SIMPLEITK-85_SetGetPixelsOfVectors' into next

01166e3 For Python add support for long index types.
2114915 Ignore GetBuffer methods for most wrapped languages.