API: read_csv,from_csv/to_csv keyword consistency
method naming consistency issue #577
- [ ] `to_csv` uses line_terminator and `read_csv` uses lineterminator
- [x] `compression` kw #7615  (#11219)
- [x] `sep/delimiter` #7662
- [x] `from_csv` differs from `read_csv` #9556 (#10163)
- [x] `decimal` #8448  (https://github.com/pandas-dev/pandas/commit/671c4b3c52a02ee3736752b2645d08762c0fedaf)
