Fix path issues with tools and their spec files

A tool spec file apparently has to be in the same folder as the main program file.
Also changed 'includes_main_path' attributes in tool spec files to relative paths
(see #940).

.spinetoolbox/project.json

@@ -8,7 +8,7 @@
                 {
                     "type": "path",
                     "relative": true,
-                    "path": "tools/spineToolbox.json"
+                    "path": "spineToolbox.json"
                 },
                 {
                     "type": "path",

spineToolbox.json

@@ -27,5 +27,5 @@
     ],
     "cmdline_args": [],
     "execute_in_work": false,
-    "includes_main_path": "C:/HJY_projects/spine/Case_study_B3/BB_in_Spine"
-}
\ No newline at end of file
+    "includes_main_path": "."
+}

tools/bb_base_sets.json

@@ -8,10 +8,10 @@
     "inputfiles": [],
     "inputfiles_opt": [],
     "outputfiles": [
-        "Backbone_base_sets.gdx",
-        "Backbone_base_sets_to_gdx.lst"
+        "Backbone_base_sets_to_gdx.lst",
+        "Backbone_base_sets.gdx"
     ],
     "cmdline_args": [],
     "execute_in_work": false,
-    "includes_main_path": "C:/HJY_projects/spine/Case_study_B3/BB_in_Spine"
-}
\ No newline at end of file
+    "includes_main_path": "."
+}