fix: import/export under windows.

Export used native \r\n line endings on windows.  This results in
blank lines when read and Roundup crashes on import.

Use \n line endings when writing due to the hard coded \n or \r (but
not \r\n) line terminator expected by csv.reader().

Also updates CHANGES.txt to cover this and a the fix for
{Otk,Session}.clear() when backed by dumb dbm on windows.

Author: rouilj

CHANGES.txt

@@ -119,6 +119,10 @@ Fixed:
   incorrect when paginated - correct values are now returned.
   (John Rouillard)
 - issue2551331 - Fix repeat first/last methods. (John Rouillard)
+- Fix import/export on windows. Use unix line terminating characters.
+  (John Rouillard)
+- Fix anydbm session/otks clear() method on windows when backed by
+  dumbdbm. (John Rouillard)
 
 
 Features:

roundup/admin.py

@@ -630,7 +630,7 @@ class colon_separated(csv.excel):
                                  classname)
 
             with open(os.path.join(export_dir, classname + '.csv'), 'w') as f:
-                writer = csv.writer(f, colon_separated)
+                writer = csv.writer(f, colon_separated, lineterminator='\n')
 
                 propnames = cl.export_propnames()
                 fields = propnames[:]
@@ -685,7 +685,7 @@ class colon_separated(csv.excel):
                     sys.stdout.write("\nExporting Journal for %s\n" %
                                      classname)
                     sys.stdout.flush()
-                journals = csv.writer(jf, colon_separated)
+                journals = csv.writer(jf, colon_separated, lineterminator='\n')
                 for row in support.Progress("   Writing journals",
                                             cl.export_journals()):
                     journals.writerow(row)
@@ -1236,7 +1236,7 @@ class colon_separated(csv.excel):
 
             # ensure that the properties and the CSV file headings match
             with open(os.path.join(import_dir, file), 'r') as f:
-                reader = csv.reader(f, colon_separated)
+                reader = csv.reader(f, colon_separated, lineterminator='\n')
                 file_props = None
                 maxid = 1
                 # loop through the file and create a node for each entry
@@ -1260,7 +1260,7 @@ class colon_separated(csv.excel):
 
             # import the journals
             with open(os.path.join(import_dir, classname + '-journals.csv'), 'r') as f:
-                reader = csv.reader(f, colon_separated)
+                reader = csv.reader(f, colon_separated, lineterminator='\n')
                 cl.import_journals(reader)
 
             # (print to sys.stdout here to allow tests to squash it .. ugh)