replace ludb with data-store

LuDB has a few disadvantages. 
  1. Most notably disk space. H2 wastes a lot of valuable disk space.
     For my test data set with 44 million entries it is 14 MB 
     (sometimes a lot more; depends on H2 internal cleanup). With 
     data-store it is 15 KB.
     Overall I could reduce the disk space from 231 MB to 200 MB (13.4 %
     in this example). That is an average of 4.6 bytes per entry.
  2. Speed:
     a) Liquibase is slow. The first time it takes approx. three seconds
     b) Query and insertion. with data-store we can insert entries 
        up to 1.6 times faster.

Data-store uses a few tricks to save disk space:
  1. We encode the tags into the file names.
  2. To keep them short we translate the key/value of the tag into 
     shorter numbers. For example "foo" -> 12 and "bar" to 47. So the
     tag "foo"/"bar" would be 12/47. 
     We then translate this number into a numeral system of base 62
     (a-zA-Z0-9), so it can be used for file names and it is shorter.
     That way we only have to store the mapping of string to int.
  3. We do that in a simple tab separated file.

pdb-ui/src/test/java/org/lucares/performance/db/ingestor/TcpIngestorTest.java

@@ -14,8 +14,8 @@ import java.util.Map;
 
 import org.lucares.pdb.api.Entry;
 import org.lucares.pdbui.TcpIngestor;
-import org.lucares.performance.db.FileUtils;
 import org.lucares.performance.db.PerformanceDb;
+import org.lucares.utils.file.FileUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.testng.Assert;
@@ -23,8 +23,6 @@ import org.testng.annotations.AfterMethod;
 import org.testng.annotations.BeforeMethod;
 import org.testng.annotations.Test;
 
-import liquibase.exception.LiquibaseException;
-
 @Test
 public class TcpIngestorTest {
 
@@ -42,7 +40,7 @@ public class TcpIngestorTest {
 		FileUtils.delete(dataDirectory);
 	}
 
-	public void testIngestDataViaTcpStream() throws LiquibaseException, Exception {
+	public void testIngestDataViaTcpStream() throws Exception {
 
 		final OffsetDateTime dateA = OffsetDateTime.now();
 		final OffsetDateTime dateB = OffsetDateTime.now();