Create mod subdirs when merging

When walking the list of files to merge from a mod, also try to create
any subdirectories those files may be in.

Closes #173

Author: pjf

core/mods.py

@@ -197,6 +197,15 @@ def merge_folder(mod_folder, vanilla_folder, mixed_folder):
     Text files are merged; other files (sprites etc) are copied over."""
     status = 0
     for root, _, files in os.walk(mod_folder):
+
+        # We want to make any directory in our mod folder in the mixed folder
+        # if it doesn't already exist. Fixes #173
+        mixed_dir = os.path.join(mixed_folder,
+                                 os.path.relpath(root, mod_folder))
+
+        if not os.path.isdir(mixed_dir):
+            os.makedirs(mixed_dir)
+
         for k in files:
             f = os.path.relpath(os.path.join(root, k), mod_folder)
             log.push_prefix('file "' + f + '": ')

tkgui/tkgui.py

@@ -580,7 +580,7 @@ def show_about():
             title='About', message="PyLNP "+VERSION +" - Lazy Newb Pack Python "
             "Edition\n\nPort by Pidgeot\nContributions by PeridexisErrant, "
             "rx80, dricus, James Morgensen, jecowa, carterscottm, McArcady, "
-            "fournm, rgov, cryzed\n\n"
+            "fournm, rgov, cryzed, pjf\n\n"
             "Original program: LucasUP, TolyK/aTolyK")
 
     @staticmethod