Multi thread data consistency test and more enhancement

[skyper]

Please, have the data consistency test run in multi thread on multi-core machines.

Some more enhancement:

• show the time the test took like validator in the console
• allow to send it in background and allow to work on other layers + download to new layers.

See #10488 for an example file.

[Don-vip]

In 7500/josm:

see #10483 - print elapsed time of data consistency test + update javadoc

[Don-vip]

"Search ways" appears to be very slow:

DEBUG: Test 'DatasetConsistencyTest.referredPrimitiveNotInDataset' completed in 513 ms
DEBUG: Test 'DatasetConsistencyTest.checkReferrers' completed in 376 ms
DEBUG: Test 'DatasetConsistencyTest.checkCompleteWaysWithIncompleteNodes' completed in 163 ms
DEBUG: Test 'DatasetConsistencyTest.checkCompleteNodesWithoutCoordinates' completed in 186 ms
DEBUG: Test 'DatasetConsistencyTest.searchNodes' completed in 2.9 s
DEBUG: Test 'DatasetConsistencyTest.searchWays' completed in 1 min 17 s
DEBUG: Test 'DatasetConsistencyTest.checkZeroNodesWays' completed in 147 ms
DEBUG: Test 'DatasetConsistencyTest.runTest' completed in 1 min 22 s

[Don-vip]

In 7501/josm:

fix #10483 - drastic improvement of data consistency test performance

[Don-vip]

Much better now:

DEBUG: Test 'DatasetConsistencyTest.referredPrimitiveNotInDataset' completed in 558 ms
DEBUG: Test 'DatasetConsistencyTest.checkReferrers' completed in 409 ms
DEBUG: Test 'DatasetConsistencyTest.checkCompleteWaysWithIncompleteNodes' completed in 169 ms
DEBUG: Test 'DatasetConsistencyTest.checkCompleteNodesWithoutCoordinates' completed in 181 ms
DEBUG: Test 'DatasetConsistencyTest.searchNodes' completed in 1.5 s
DEBUG: Test 'DatasetConsistencyTest.searchWays' completed in 287 ms
DEBUG: Test 'DatasetConsistencyTest.checkZeroNodesWays' completed in 149 ms
DEBUG: Test 'DatasetConsistencyTest.runTest' completed in 3.3 s

[Don-vip]

In 7502/josm:

see #10483 - fix error message