Update pdf to v2.9.0

See merge request !236

Develop hotfixes 2.9.0 a

See merge request !235

Update documentation

See merge request !233

fix condition

See merge request !234

Retrieve only the number in the cdo version. Exclude the letter part.

See merge request !228

Correct Corr() p value.

See merge request !230

Checking first time stamp in file

See merge request !231

Fix example in Composite.R and update .Rd

See merge request !232