Pyult

Added the verbose argument to pyult.image.to_fan and pyult.image.to_fan_2d.

1. A new argument "size" to pyult.image.to_square, which specifies lengths of sides of the result image.
2. A new function "pyult.image.time_to_frame", which converts (a list of) time to its (their) corresponding frame(s).
3. A new method "pyult.recording.filter_by_segments", which extracts only the frames that correspond to the segments specified by the method's argument "segments".
4. pyult.recording.imgs_to_df and pyult.recording.square_imgs are updated to have a new argument "inplace". With the argument being FALSE, a recording object is returned.
5. pyult.Session.load_recording is updated and now returns a Recording object with a new attribute "rec.ID". "rec.ID" is given through the argument "basename_or_index" of pyult.Session.load_recording.
6. Bug fix, when xxx.words and xxx.phoneswithQ exist and read to attributes of the Recording class.

In this release, a new class "Session" is introduced (in pyult.session). This class handles a directory of recordings, where all the relevant files (e.g. xxxUS.txt) are stored. You give a path to the directory, and you can check if you have all the necessary files. Also, you can pick one recording from the class, which returns an instance object of the Recording class.

Added simple functionality to read and save images in pyult.image and their corresponding class methods in pyult.recording.

Minor bug fixed: Error handing when corresponding recording IDs are not found in frames.csv

With this update, multiple frames can be specified for each recording, so only those frames are to be produced as png images.