non-integer value support for minoverlap argument of foverlaps function

[sainathadapa]

I frequently need to find the overlaps in timeseries data. These can be of the order of milliseconds sometimes. Minoverlap argument needs to have a value of greater than 1 and it should be integer. I currently find overlaps over millisecond data instead of seconds data as a workaround. But float value support for minoverlap will be helpful for analysing POSIXct (converted into numeric) data direclty without for a need to do any furthur processing.

[arunsrinivasan]

minoverlaps is not yet implemented. But I agree it needn't be an integer. Added to 1.9.8.