Preview release 0.3.3

lis.load now raises by default when a file cannot be successfully indexed. In previous versions only a warning was issued and a partially indexed file was returned.
lis.load now accepts a dlisio.ErrorHandler-instance similar to dlis.load. This allows the caller to decide how load behaves when a file cannot be properly indexed.
dlisio has learned to parse the following LIS records: Operator Command Inputs, Operator Response Inputs, System Outputs to Operator and FLIC Comment.
LIS Data Format Specification Records have been given a more user-friendly interface through lis.DataFormatSpec.
dlisio has learned to read LIS curves where the index is recorded in depth recording mode 1.
dlisio has learned to read LIS curves that are sampled at a higher rate than the recorded index (Fast Channels)
dlisio has learned to read LIS curves with non-scalar sample-values.
dlisio has learned to read LIS curves containing strings.
Added safe-guards against ZeroDevisionError's in lis.curves
The predecessor and successor bits in the LIS Physical Records Headers are checked for consistency during the indexing routines.
Error messages emitted from the indexing routines at lis.load are now properly communicated to the caller.

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