add automatic fix for "natural water used for swimming pool"

[mkoniecz]

According to pond section of ​http://wiki.openstreetmap.org/wiki/Key:water and #10119
natural=water + leisure=swimming_pool should be fixed by removing natural=water.

So it is possible to add automatic fix for this problem (removing natural=water).

As it is easy to imagine why somebody would add natural=water to leisure=swimming_pool it is almost impossible that somebody would add leisure=swimming_pool to natural=water in situation where it is not a swimming pool so automatic fix would not cause problems and would reduce confusion about what is a problem and how it should be fixed (mine resulted in #10119).

Repository Root: http://josm.openstreetmap.de/svn
Build-Date: 2014-06-09 01:34:44
Last Changed Author: akks
Revision: 7224
Repository UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
URL: http://josm.openstreetmap.de/svn/trunk
Last Changed Date: 2014-06-08 22:01:41 +0200 (Sun, 08 Jun 2014)
Last Changed Rev: 7224

Identification: JOSM/1.5 (7224 en) Windows 7 32-Bit
Memory Usage: 247 MB / 247 MB (27 MB allocated, but free)
Java version: 1.7.0_55, Oracle Corporation, Java HotSpot(TM) Client VM
Dataset consistency test: No problems found

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[Don-vip]

In 7274/josm:

fix #10129 - add automatic fix for "natural water used for swimming pool"