Revert "partly going back: call to splot.default in lplot"

This reverts commit 08e23e579a6c4a8331489f561cdaee5daba270f9.
Revert "plutils pre v0.3.0"

This reverts commit 3648f4d89a283dd64313ca1b49ae87ff120ca817.
Revert "plutils v0.3-pre-alpha"

This reverts commit c76ecf3c24088021d40a8939233458a14252cd43.