Changes to read_ncswan and read_wwm to ensure datasets are loaded lazily

Fixed tp-smooth bug caused by float32 data type

fix bugs of frquency and energy units in read wwm

Ensuring dataset from swan netcdf has site coordinate

Converting directions to degrees when reading spectra from new swan n…

…etcdf files

Read swan netcdf capability

Syncronised library and git versions; fixed read_swans when reading b…

…nd swan files with multiple sites.

Changed wind stdnames to specify 10m convention

Fix stats renaming, upgrading standard_names

Allow choosing maximum number of partitions