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* support dgcnn

* support dgcnn

* support dgcnn

* support dgcnn

* support dgcnn

* support dgcnn

* support dgcnn

* support dgcnn

* support dgcnn

* support dgcnn

* fix typo

* fix typo

* fix typo

* del gf&fa registry (wo reuse pointnet module)

* fix typo

* add benchmark and add copyright header (for DGCNN only)

* fix typo

* fix typo

* fix typo

* fix typo

* fix typo

* support dgcnn

* add configs for pn2 on s3dis

* fix bugs

* add README for PN2 segmentor

* update configs file after experiments

* update README

* add base schedule files for seg configs

* rename pn2_seg config files

* update pn2 links in README

* add metafile for pn2