TODO: new features/updates

[pjebs]

1. ~~Update copyright + remove coverall~~
2. ~~Add Row function to dataframe (also allow it to decide what of data is returned) + DeepLock opt~~
3. ~~In utils, Search function to allow option to stop after finding N values.~~
4. ~~In imports pkg, for importing from SQL, change from stmt to interface.~~
5. ~~Allow imports.CSVLoadOptions to have default Comma,~~
6. ~~Allow imports.DictateDataType to accept Series type (to allow for custom data)~~
7. ~~Create random Series and Dataframes (with a random interface)~~
8. ~~Change signature of Sort functions to accept context. Perhaps add ctx to more functions.~~
9. ~~Allow custom time formats when importing.~~
10. Add some more popular Pandas functions. (https://www.dataquest.io/blog/pandas-cheat-sheet/)
11. ~~Add example in readme on how to integrate with gonum pkg.~~
12. Add ~~Filter~~, GroupBy and Join (and also Append df): https://github.com/robpike/filter
13. ~~Generate fake data for Dataframe~~
14. ~~SeriesTime should be generate intervals~~
15. Arima forecasting
16. Add epsilon to SeriesFloat64
17. Consider implementing OrderedMaps with doubly linked lists: http://www.tugberkugurlu.com/archive/implementing-ordered-map-in-go-2-0-by-using-generics-with-delete-operation-in-o-1-time-complexity and https://github.com/elliotchance/orderedmap
18. Create a new Series type that uses a linked list container/list package for float64 data instead of an []float64. (PUT IN XSERIES PKG): https://github.com/huandu/skiplist
19. Remove locking functionality -> leave to users to implement externally
20. Clean up api with regards to a function to accept values (and always make options optional). V(args ...interface{})
21. Advocate dot import for V function (pkg name dot)
22. ~~When importing from csv, allow series names to be chosen when the csv file doesn't have a headings row (Headings option)~~ Thanks @pasdam
23. df.AddSeries should increase number of rows of newly added series automatically to match number of rows in df
24. Make Apply and Filter operate concurrently
25. Add alias for maths variables as an option: fn := funcs.RegFunc("sin(2*𝜋*x/24)")funcs.Evaluate(ctx, df, fn, 1)
26. Create adapter for: https://github.com/go-echarts/go-echarts
27. Parquet export - configure time type per series
28. Explore Range embedding/chaining another Range (to define multiple ranges)
29. ~~For Values Iterator, interpret Step=0 as Step=1~~
30. For utils/faker, use gofakeit v6 and also create constants for the function names.
31. Use rowerr for json importing