We very well support `nth 0 2 3 --skip 1 4` to select particular rows and skip some using a flag. However, in practice we deal with tables (whether they come from parsing or loading files and whatnot) where we don't know the size of the table up front (and everytime we have these, they may have different sizes). There are also other use cases when we use intermediate tables during processing and wish to always drop certain rows and **keep the rest**.
Usage:
```
... | drop nth 0
... | drop nth 3 8
```
* Refactor Hash code to simplify md5 and sha256 implementations
Md5 and Sha256 (and other future digests) require less boilerplate code
now. Error reporting includues the name of the hash again.
* Add missing hash sha256 test
Hashers now uses on Rust Crypto Digest trait which makes it trivial to
implement additional hash functions.
The original `md5` crate does not implement the Digest trait and was
replaced by `md-5` crate which does. Sha256 uses already included `sha2`
crate.
* nuframe in its own type in UntaggedValue
* Removed eager dataframe from enum
* Dataframe created from list of values
* Corrected order in dataframe columns
* Returned tag from stream collection
* Removed series from dataframe commands
* Arithmetic operators
* forced push
* forced push
* Replace all command
* String commands
* appending operations with dfs
* Testing suite for dataframes
* Unit test for dataframe commands
* improved equality for dataframes
This allows converting strings to filepaths without having to use
`path expand` roundtrip.
Filepaths are taken as-is without any validation/conversion.
* Type in command description
* filter name change
* Clean column name
* Clippy error and updated polars version
* Lint correction in file
* CSV Infer schema optional
* Correct float operations
* changes in series castings to allow other types
* Clippy error correction
* Removed lists from command signatures
* Added not command for series
* take command with args
* set with idx command
* Type in command description
* filter name change
* Clean column name
* Clippy error and updated polars version
* Lint correction in file
* CSV Infer schema optional
* Correct float operations
* changes in series castings to allow other types
* Clippy error correction
* Removed lists from command signatures
* Added not command for series
* Add paste command
* fix build and format failures
* Add examples
* Make tests pass
* Format
* add cfg annotation for Clip
* format code
* remove additional import for clip
* Remove test
