Fix large integer queries

Summary

This MR does two things:

• Fix https://gitlab.com/caosdb/caosdb-server/-/issues/145
• Expose some internals of POV.java for unittests.

Please merge together with caosdb-pyinttest!35 (merged)

Focus

• Was the cast to integer necessary before?
• Was the required dot in Doubles necessary before?

Test Environment

Unit tests, integration tests.

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• Reference related issues #239 (closed)
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src/main/java/org/caosdb/server/query/POV.java

@@ -134,7 +134,8 @@ public class POV implements EntityFilterInterface {
       } else {
         try {
           // Doubles are allowed without dots, for example when the integer overflows.
-          final Pattern dp = Pattern.compile("^(-?[0-9]+(?:\\.)?(?:[0-9]+))\\s*([^-]*)$");
+          // final Pattern dp = Pattern.compile("^(-?[0-9]+(?:\\.)?(?:[0-9]+))\\s*([^-]*)$");
+          final Pattern dp = Pattern.compile("^(-?[0-9]+(?:\\.[0-9]+))\\s*([^-]*)$");
           final Matcher m = dp.matcher(value);
           if (!m.matches()) {
             throw new NumberFormatException();