New version: Jchemo v0.7.0

[JuliaRegistrator]

• Registering package: Jchemo
• Repository: https://github.com/mlesnoff/Jchemo.jl
• Created by: @mlesnoff
• Version: v0.7.0
• Commit: 591125550d670772c0a2170818de6de4afc3803a
• Reviewed by: @mlesnoff
• Reference: mlesnoff/Jchemo.jl@5911255#commitcomment-150936269
• Description: Tools for chemometrics and machine learning on high-dimensional data (e.g. Partial least squares regression/discrimination)
• Release notes:

## Breaking changes

- Breaking
    - **dummy**: To improve time computations, the output 'Y' is now a BitMatrix.
    - **fweight**: remaned to **wdis**.
    - **iqr**: renamed to **iqrv**.
    - **mad**: renamed to **madv**.
    - **normw**: renamed to **normv**.
    - **fweightdis**: renamed to **wdis**.
    - **plotgrid**: argument 'title_leg' renamed to 'leg_title'.
    - **talworth**: renamed to **wtal**.
    - **wdist**: renamed to **winvs**.
    - Sparse Pca/Pls regression & discrimination:
        - **splskern**: renamed to **splsr**.
        - Argument'meth' has changed.

- New (not breaking)
    - **fweight**: Weight each row of a matrix.
    - **sumv**, **meanv**, **stdv**, **varv**: Vector operations.
    - **frob2**: Square of the Frobenius norm of a matrix.
    - **spcr**: Sparse PCR.

- Other modifications (not breaking)
    - Code cleaning.

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