reinstate the original, more generic, license for "scan", "sample", "pt" and "qbeta"

...n/src/com/oracle/truffle/r/nodes/builtin/base/Sample.java

...tin/src/com/oracle/truffle/r/nodes/builtin/base/Scan.java

...time/src/com/oracle/truffle/r/runtime/nmath/distr/Pt.java

...e/src/com/oracle/truffle/r/runtime/nmath/distr/QBeta.java

mx.fastr/copyrights/gnu_r_sample.copyright.star

mx.fastr/copyrights/gnu_r_sample.copyright.star.regex

mx.fastr/copyrights/gnu_r_scan.copyright.star

mx.fastr/copyrights/gnu_r_scan.copyright.star.regex