fix exp_ss_mat bug

Because _save_states could not seperate save name from frame to slide matching
and slide to slide matching, so we add a prefx key to prevent this situation.
Making pari_feats exp support batch config
fix pairing common save key bug
support ransac & area & invweight for pairing
pairing for the last frame or slide
make invw work
no slide elimnation roc
add roc_grid plotter
add texer
add tex notes
Merge pull request #88 from speed-of-light/xf_ext1

Xframes Extension - No Slide classification