doc: Updated documentation about projtargets
script: Source code of Tisean rescale added
scripts: Option -u to Tisean rescale

Option -u to use the unbiased estimator for variances.
tica: Calculate tica from rescaled pca data

Thus, the pca transformation and rescaling
is calculated only once for all lag times.
doc: TICA is now calculated from PCA data
Merge branch 'master' into tica