Savnet

- Python3 compatibility

* Add sample_num_filter argument for trans association detection.
* Add active_zero_filter_prob and inactive_nonzero_filter_prob argument for trans association detection.
* Several fixation for intermediate filename and help messages.

* Modify logging structure
* Abolish --grc argument

* Improve package structure
* Add several classes (e.g., Network and Sav classes)
* Modify splicing class and mutation class names
* Many bug fixes
* Add many test cases
* Acceptance of vcf format
* Abolish —mutation_format argument
* Dependent tool check before execution
* Detection of SVs causing splicing changes (still beta version)

Changed to remove intermediate files

Release at the stage of the first biorxiv submission.