Improve seam allowance.

Increase max allowed length of corner to cover real world case.

src/libs/vlayout/vabstractpiece.cpp

@@ -51,7 +51,7 @@
 const quint32 VAbstractPieceData::streamHeader = 0x05CDD73A; // CRC-32Q string "VAbstractPieceData"
 const quint16 VAbstractPieceData::classVersion = 2;
 
-const qreal maxL = 2.5;
+const qreal maxL = 3.5;
 
 const qreal VSAPoint::passmarkFactor = 0.5;
 const qreal VSAPoint::maxPassmarkLength = (10/*mm*/ / 25.4) * PrintDPI;

src/test/ValentinaTest/share/Issue_298_case1/output.json

@@ -117,13 +117,8 @@
         },
         {
             "type": "QPointF",
-            "x": 1033.62206579804,
-            "y": 991.8906443458876
-        },
-        {
-            "type": "QPointF",
-            "x": 940.8759712878797,
-            "y": 1031.2978406173477
+            "x": 1034.5174749200823,
+            "y": 1122.8420636232784
         },
         {
             "type": "QPointF",

src/test/ValentinaTest/share/Issue_548_case1/output.json

@@ -27,13 +27,8 @@
         },
         {
             "type": "QPointF",
-            "x": 29.78045942584839,
-            "y": 314.5929172205191
-        },
-        {
-            "type": "QPointF",
-            "x": 17.016714467558195,
-            "y": 305.7450353602103
+            "x": 11.986528767485936,
+            "y": 326.6317413168879
         },
         {
             "type": "QPointF",