Dimensional analysis strength

[kreindata]

By default, the function normalizes the PCA percent variance explained results around 0 and then selects all positive (above average) components for dimensional analysis. I would like to implement 'strengths' to this analysis. For instance, allowing for selection around 0.5, -0.5, or custom strength. I'll add an argument to the function for this.

[kreindata]

Added strength and dims options for customizable PCA strength and number of dimensions. I would still like to add a path for total percent explained as the core component for analysis.