Auxiliary function called from pshPLE, wcPLE and MLEFrailty.

The estimation using PLE (e.g. Kaplan-Meier) is a decreasing constant piecewise function with jumps in the times with events. Thus, to estimate the survival at any time we take the time of the precious event.

1 2 | ```
surv.search(tvals,time,surv)
``` |

`tvals` |
vector of times where the survival function has to be estimated |

`time` |
vector of failures times (distinct) |

`surv` |
vector of survival of each time |

Returns the survival in each selected time (tvals) from a vector of survival values

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