Suggest easing of restriction on number of releases in readpartpositions.f90

[donaldjmorton]

Given another very bad fire year in Alaska, I am running FLEXPART operationally, warm starting from one run to the next. Because of the dynamic nature of releases (new fires, some fires suppressed), it is normal that the number of releases saved from a previous run to warm start a new run will not be the same as the number of releases in the new run.

In readpartpositions.f90, I have found it necessary to comment out the following code (in the vicinity of Line 78) in order to allow for different number of releases from one run to the next.

  read(unitpartin) numpointin
!!!!!!!!!!!!!! MODIFICATION DJM  2015-06-20 - comment out the
!!!!!!!!!!!!!! following restriction
! if (numpointin.ne.numpoint) goto 995

I understand there may be very good reason to have this restriction, but at least in my case it gets in the way.

[pesei]

If we accept this in the main Fp code, I would at least output a very visible WARNING.