Combine iter records range into iter records #310
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Using iterRecords with a range option should be faster than calling record within a loop, since we avoid the multiple calls to seek.
This reverts commit e41b03c. JamesParrott pointed that I did not understand the way `__record` works: __record does not use oid to find the correct record, it just assumes it is the correct oid for the current position.
Using the method `iterRecords_range` should be somewhat faster than calling the method `record` within a loop, since we avoid the repeated calls to seek inside `record`.
…eek(0) before f.seek(..)
… returned as from Reader.record
… detail, not a shapefile record property)
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