GitLab

- Updated README.md: transfered from gitlab.irstea to github
- changed return() into return(invisible())
- updated vignettes & tutorial with latest outputs and figures from code

- modified editor in select_PCA_components
- updated outputs returned from raster2BIL and select_PCA_components

- updated example_script

- changed check_data function to handle mask files

- import check_data into perform_radiometric_filtering and perform_PCA

- added documentation to repository

- added imports (prcomp...)
- simplified 'PCA_Info.RData', now only called once in map_spectral_species
- changed dots into underscores for names of most variables
- added missing input variables

- changed version to 0.9

- change field plots

- changed NAMESPACE

- changed . into _ for function names
- removed capital letters when needed in function names
- changed Spatial.Units into window_size