be more explicit, only exif_transform jpegs, and if mode is not rgb convert it first before thumbnail - fixes BUG-63 no thumbs for GIFs

BUGs

@@ -1,4 +1,4 @@
-### Next: 64
+### Next: 65
 BUG-56: when making a viewing list of AI:mich, (any search?) and going past the page_size, it gets the wrong data from the DB for the 'next' entry
 BUG-60: entries per page (in folders view) ignores pagesize, and this also contributes to BUG-56 I think
 BUG-61: in Fullscreen mode and next/prev occasionally dropped out of FS
@@ -19,5 +19,6 @@ BUG-62: viewlist on venice subdir and 'next' crashes server with a 500
     ESC[36mpaweb                 |ESC[0m   File "/code/files.py", line 478, in viewlist
     ESC[36mpaweb                 |ESC[0m     current = int(lst[0])
     ESC[36mpaweb                 |ESC[0m ValueError: invalid literal for int() with base 10: ''
-BUG-63: gif without thumbmnail (eg 20180704_104637.gif)
-    https://freeyeti.net/en/a/create-thumbnail-for-a-gif-image
+
+BUG-64: seems when we move files, then somehow this triggers a lot of md5/thumb action (just for the moved files?) as they get a new? FILE entry -- why do I do that if that is the case,
+    the file, hash, thumb, faces, etc. should all still be connected to the FILE entry and just make it have a new home...

shared.py

@@ -113,9 +113,10 @@ def SymlinkName(ptype, path, file):
 def GenThumb(fname):
     try:
         im_orig = Image.open(fname)
-        im = ImageOps.exif_transpose(im_orig)
-        bands = im.getbands()
-        if 'A' in bands:
+        if im_orig.format == 'JPEG':
+            im = ImageOps.exif_transpose(im_orig)
+        im = im_orig
+        if im.mode != "RGB":
             im = im.convert('RGB')
         orig_w, orig_h = im.size
         im.thumbnail((THUMBSIZE,THUMBSIZE))