Sanzang-utils

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* Added more helpful and verbose output to szu-ed.
* Removed table format checks from all tools except szu-ed.

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* Reimplemented core algorithm for szu-r (cleaner and faster).
* Added missing delimiter in buffering algorithm for szu-r.
* Added a bit of missing Unicode normalization to szu-r.
* Edited writing message for szu-ed to include the line count.

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* Fixed input_lines support in szu_ed.py so editing terminates normally.
* Added a "file written" message to szu-ed. File writing is important...

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* Converted all programs into Python modules that can be imported.
* Refactored modules for more convenient use in calling code.
* Converted Makefile install / uninstall to use pip3.
* New directory layout (but installation to the same directories).
* Updated documentation for new installation procedure.

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* More thorough Unicode normalization for the table editor (szu-ed).

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* Added basic Unicode normalization for safety and compatibility.