updated the rest of the indices functions (removed member_dim, added na.rm, now they use multiApply, updated documentation)

Develop persistence check

See merge request !38

Not use Apply() in InsertDim

See merge request !47

Develop Histo2Hindcast

See merge request !45

Develop acc

See merge request !40

Add parameter 'memb_dim' and 'memb' in Corr(). Create unit tests and modify the examples.

See merge request !39

Develop Season onedim

See merge request !44

Develop ncores usage

See merge request !46

MeanDims update

See merge request !42