[refactor] do some works

- move gitignore in individual directories.
- change some directory layout.
- refactor NlpCodec but not finished.

NlpTr/.gitignore

@@ -0,0 +1,2 @@
+# Ignore result
+out/

NlpTr/VT30.diff

@@ -1,22 +0,0 @@
-i/650
-i/1222
-i/1223
-i/1224
-i/1225
-i/1226
-i/1227
-i/1228
-i/1229
-i/1440
-i/1452
-i/1646
-i/1756
-i/1757
-i/1758
-i/1759
-i/1760
-i/1761
-i/1762
-i/1763
-i/1764
-d/1431

NlpTr/VT35.diff

@@ -1,19 +0,0 @@
-i/35
-i/79
-i/252
-i/263
-i/264
-i/265
-i/607
-i/608
-i/671
-i/1233
-i/1234
-i/1235
-i/1236
-i/1333
-d/1324
-d/666
-d/603
-d/602
-d/250

NlpTr/VT40.diff

@@ -1,5 +0,0 @@
-i/210
-i/605
-i/612
-d/611
-d/210

NlpTr/VT50.diff

@@ -1,68 +0,0 @@
-i/58
-i/103
-i/152
-i/495
-i/496
-i/654
-i/655
-i/656
-i/657
-i/658
-i/659
-i/660
-i/661
-i/662
-i/663
-i/664
-i/714
-i/725
-i/726
-i/727
-i/728
-i/729
-i/730
-i/731
-i/740
-i/741
-i/742
-i/743
-i/744
-i/745
-i/1077
-i/1078
-i/1079
-i/1080
-i/1081
-i/1082
-i/1083
-i/1084
-i/1085
-i/1086
-i/1087
-i/1088
-i/1175
-i/1176
-i/1177
-i/1178
-i/1179
-i/1333
-i/1334
-i/1508
-i/1509
-i/1510
-i/1511
-i/1577
-i/1578
-d/728
-d/727
-d/726
-d/725
-d/657
-d/656
-d/655
-d/654
-d/653
-d/652
-d/651
-d/650
-d/150