improve failed items report for analyze chains command

src/main/groovy/cz/siret/prank/domain/Dataset.groovy

@@ -23,6 +23,7 @@ import cz.siret.prank.utils.Sutils
 import cz.siret.prank.utils.Writable
 import groovy.transform.CompileStatic
 import groovy.util.logging.Slf4j
+import org.apache.commons.lang3.exception.ExceptionUtils
 import org.biojava.nbio.structure.Atom
 import org.biojava.nbio.structure.Group
 
@@ -1070,6 +1071,20 @@ class Dataset implements Parametrized, Writable, Failable {
             Futils.writeFile(csvFile, sb.toString())
         }
 
+        void writeFullItemErrorsToFile(String txtGzFile) {
+            if (!hasErrors()) {
+                return
+            }
+
+            try (Writer out = Futils.getGzipWriter(txtGzFile)) {
+                for (ItemError ie : errorItems) {
+                    out.write("Item: ${ie.item.label}\n")
+                    out.write(ErrorUtils.stackTraceToString(ie.exception))
+                    out.write("\n\n")
+                }
+            }
+        }
+
     }
 
     static class ItemError {

src/main/groovy/cz/siret/prank/program/routines/analyze/AnalyzeRoutine.groovy

@@ -186,6 +186,7 @@ class AnalyzeRoutine extends Routine {
         writeFile "$outdir/chains.csv", csv
 
         res.writeItemErrorsToCsv("$outdir/errors.csv")
+        res.writeFullItemErrorsToFile("$outdir/errors_full.txt.gz")
 
         write "Processed ${dataset.size} items"
         write res.errorSummary

src/main/groovy/cz/siret/prank/utils/ErrorUtils.groovy

@@ -29,4 +29,8 @@ class ErrorUtils {
         return ExceptionUtils.getRootCauseMessage(throwable)
     }
 
+    public static String stackTraceToString(Throwable throwable) {
+        return ExceptionUtils.getStackTrace(throwable)
+    }
+
 }