Replace float8 with int in date2isoweek() and date2isoyear().HEADmaster

The values of the "result" variables in these functions are
always integers; using a float8 variable accomplishes nothing
except to incur useless conversions to and from float.  While
that wastes a few nanoseconds, these functions aren't all that
time-critical.  But it seems worth fixing to remove possible
reader confusion.

Also, in the case of date2isoyear(), "result" is a very poorly
chosen variable name because it is *not* the function's result.
Rename it to "week", and do the same in date2isoweek() for
consistency.

Since this is mostly cosmetic, there seems little need
for back-patch.

Author: Sergey Fukanchik <[email protected]>
Reviewed-by: Tom Lane <[email protected]>
Discussion: https://postgr.es/m/6323a-68726500-1-7def9d00@137821581

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