New general DataFrame

[Axect]

Peroxide already supported dataframe feature, but it is only for f64 data type. So, our new general DataFrame should have following features :

• [x] Various data types Series
  • [x] Integer (usize, u8, u16, u32, u64, isize, i8, i16, i32, i64)
  • [x] Float (f32, f64)
  • [x] String
  • [x] bool
  • [x] char
• [x] Type casting
  • [x] Series type casting
  • [x] DataFrame type casting
• [x] Unified DataFrame
  • [x] Index<usize>
  • [x] Index<&str>
  • [x] IndexMut<usize>
  • [x] IndexMut<&str>
• [x] Pretty print
  • [x] Series
  • [x] DataFrame
• [ ] Support various format IO
  • [x] CSV (Additional feature)
  • [ ] JSON (Additional feature)
  • [ ] HDF5 (Additional feature)
  • [x] NetCDF (Additional feature)
  • [ ] Apache arrow IPC (Additional feature)
  • [x] Apache parquet (Additional feature)
• [x] Vector-like methods
  • [x] Implement Vector for numeric type Series
  • [x] Matrix from Series directly
• [x] Functional programming for Series
  • [x] map, mut_map
  • [x] fold, filter, zip_with
  • [x] take, skip, take_while, skip_while
• [ ] Translate macros to functions (to reduce compile time)

And other convenient features can be added.