Enable boolean type columns from pandas DataFrame to be suitably converted into numpy structured array

Remove skip directory condition when directory keywords are empty. Here, all paths to files should be considered.

Add constraint to match only path/to/keyword1/keyword2/files containing a composite keyword keyword1/keyword2.

Add property to extracted dataset as dataframe. Now time column is of datetime type to facilitate downstream procesing.

Add validation step to yaml file validation to ensure list type and a minimun length for the 'instrument_datafolder' keyword.

Solved binary incompatibility issue of generated environment by conda installing h5py and numpy from conda-forge or default channels.