autoPath for alosStack: supp custom multilook # + ion phase/coherence

[yunjunz]

Description of proposed changes

This PR further support the auto path setting for alosStack products, after #1119.

• defaults.auto_path: add get_multilook_suffix() to grab the custom multilook suffix in the interferogram file name

• defaults.auto_path.get_reference_date(): minor bug fix in the print out msg

• defaults.auto_path.AUTO_PATH_ISCE_ALOS: add mintpy.load.ion*File default file patterns

• utils.plot.plot_coherence_history(): plot ticks on all four boundaries, and set tick in

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