Fixed and changed semantic of open relation

Now relations are always named with the default name.

Multiple relations can be opened at once from the GUI.

Removed redundant code to select the default name for a relation.

Using system dependant splitter to determine the default name for a relation.

relational_gui.py

@@ -23,6 +23,7 @@ import sys
 import os
 import os.path
 import getopt
+
 from relational import relation, parser
 version = "2.0"
 
@@ -85,8 +86,6 @@ if __name__ == "__main__":
 
         import sip  # needed on windows
         from PyQt5 import QtGui, QtWidgets
-        #FIXME remove this
-        from relational_gui import maingui, guihandler, about, surveyForm
         try:
             from relational_gui import maingui, guihandler, about, surveyForm
         except:
@@ -108,16 +107,13 @@ if __name__ == "__main__":
         ui.setupUi(form)
         form.restore_settings()
 
-        for i in range(len(files)):
-            if not os.path.isfile(files[i]):
-                print ("%s is not a file" % files[i],file=sys.stderr)
-                printhelp(12)
-            f = files[i].split('/')
-            defname = f[len(f) - 1].lower()
-            if defname.endswith(".csv"):  # removes the extension
-                defname = defname[:-4]
-            print ('Loading file "%s" with name "%s"' % (files[i], defname))
-            form.loadRelation(files[i], defname)
+        m = enumerate(map(os.path.isfile, files))
+        invalid = ' '.join((files[i[0]] for i in (filter(lambda x: not x[1], m))))
+        if invalid:
+            print ("%s: not a file" % invalid,file=sys.stderr)
+            printhelp(12)
+        if len(files):
+            form.loadRelation(files)
 
         form.show()
         sys.exit(app.exec_())