Fix handling of patch files with ':' in their name

avoids errors like this:
$ quilt refresh
sed: -e expression #1, char 21: unknown option to `s'
Nothing in patch patches/strange:name

[Satoru Takeuchi: suggested first alternative implementation not
 relying on find -printf.]
[Jean Delvare: added missing quoting and a new test file for this
 case.]

1 files changed, 47 insertions, 0 deletions

diff --git a/test/colon-in-patch-name.test b/test/colon-in-patch-name.test
new file mode 100644
index 0000000..840bd5e
--- /dev/null
+++ b/test/colon-in-patch-name.test
@@ -0,0 +1,47 @@
+$ mkdir patches
+
+$ quilt new "patch_with:strange[name]"
+> Patch patches/patch_with:strange[name] is now on top
+
+$ echo foo > foo
+$ quilt add foo
+> File foo added to patch patches/patch_with:strange[name]
+
+$ quilt files
+> foo
+
+$ echo bar > foo
+$ quilt diff -p ab -P "patch_with:strange[name]"
+> Index: b/foo
+> ===================================================================
+> --- a/foo
+> +++ b/foo
+> @@ -1 +1 @@
+> -foo
+> +bar
+
+$ quilt refresh -p ab
+> Refreshed patch patches/patch_with:strange[name]
+
+$ quilt applied
+> patches/patch_with:strange[name]
+
+$ quilt pop -q
+> Removing patch patches/patch_with:strange[name]
+> No patches applied
+
+$ quilt next
+> patches/patch_with:strange[name]
+
+$ quilt push -q "patch_with:strange[name]"
+> Applying patch patches/patch_with:strange[name]
+> Now at patch patches/patch_with:strange[name]
+
+$ quilt rename "another:strange(name)"
+> Patch patches/patch_with:strange[name] renamed to patches/another:strange(name)
+
+$ quilt series
+> patches/another:strange(name)
+
+$ quilt remove foo
+> File foo removed from patch patches/another:strange(name)