warn that integers are expected in the docs

[Dan Jacobson]

1. find man page doesn't mention address@hidden
2. On Info pages, one has to dig out address@hidden as there is
no 'reporting bugs' section.
3. there should be prominent notes all over these docs that 'n is an
integer' so the user doesn't even dream of trying -mtime +1.5 or -size
-1.5 etc.  yes, the program will tell them it is wrong, i know.

for instance, here
   TESTS
       Numeric arguments can be specified as

       +n     for greater than n,

       -n     for less than n,

       n      for exactly n.

all you gots to add is 'where n is an integer' and off your back Dan goes.
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