Read precipitation, interpolate in time

INTERFACE:

    subroutine read_precip(jul,secs,precip)

DESCRIPTION:

This routine reads the precipitation (in ms$^{-1}$) from precip_file and interpolates in time.

USES:

    IMPLICIT NONE

INPUT PARAMETERS:

    integer, intent(in)                 :: jul,secs

OUTPUT PARAMETERS:

    REALTYPE,intent(out)                :: precip

REVISION HISTORY:

    Original author(s): Karsten Bolding
    See log for airsea module