Bug fix for remove noise and testing env update

This minor release includes the following:

• fix the bug in remove_noise function for AZFP data (issue #110)
• update testing to use both python 3.7 and 3.8
• include how to pull test files using git LFS in documentation
• remove a stalled command line file converter that won't be further developed

Bug fixes and calibration parameter updates

This minor release includes a few bug fixes:

• fix zarr saving error in the Provenance group in the previous release
• fix bugs in updating environmental parameters (used for calibration) for EK60 and AZFP
• allow users to update calibration parameters in EK60
• update notebook EK60_demo_OOI.ipynb to use new raw data archive folder structure

Add more convert options, accommodate range differences

This release contains updates to the convert and model module:

• Correct file parsing and storage for split-beam angle.
• Allow user-defined environmental variables to be used in calibration.
• Accommodate EK60 setting variabilities in the range_bin dimension.
  • The raw file will be split into multiple .nc files if the length of range_bin changes in the middle.
  • For cases when different frequency has different length of range_bin, the shorter channels are padded with NaN.
• Allow combining multiple files during unpacking.
• Options to:
  • overwrite previously converted files.
  • specify output directory and filename postfix for .calibration() and .get_MVBS() operations.
• Add support to convert to .zarr file. Note processing functionalities have not been fully supported.

Add support for AZFP with uniform interface

This release includes major changes to the package structure and functionality improvements:

• Added support for handling .01A data files from the AZFP echosounder.
• Changed the module structure to enable a uniform interface to work with EK60 and AZFP data.
• Improvements to EK60 components:
  • Included NMEA datagram unpacking in file conversion routine.
  • Added handling for pings with different range setting within the same data file. This feature is experimental and the default behavior will change in future release.

Updated versioning setup

Minor update:

• use versioneer for auto-versioning

Added EK60 data model and methods

Merge pull request #31 from leewujung/master

Added EK60 model class and methods