[gegl] operations: annotate plasma's properties with property keys

[Michael Natterer <mitch src gnome org>]

commit f0d0f7807a0ab9198173a07e011f6cd3612f3e70
Author: Michael Natterer <mitch gimp org>
Date:   Fri May 16 02:25:05 2014 +0200

    operations: annotate plasma's properties with property keys
    
    Still using "role", but also some keys that feel much more permanent
    to specify properties that are coordinates and distances in buffer
    pixels.

 operations/common/checkerboard.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/operations/common/checkerboard.c b/operations/common/checkerboard.c
index 3104757..235f0a1 100644
--- a/operations/common/checkerboard.c
+++ b/operations/common/checkerboard.c
@@ -31,6 +31,8 @@ gegl_property_int (x,
     "ui-max",   256,
     "ui-gamma", 1.5,
     "blurb", _("Horizontal width of cells pixels"),
+    "unit", "pixel-distance",
+    "axis", "x",
     NULL)
 
 gegl_property_int (
@@ -43,6 +45,8 @@ gegl_property_int (
     "ui-max", 256,
     "ui-gamma", 1.5,
     "blurb", _("Vertical width of cells pixels"),
+    "unit", "pixel-distance",
+    "axis", "y",
     NULL)
 
 gegl_property_int (
@@ -51,6 +55,8 @@ gegl_property_int (
     "ui-min", -10,
     "ui-max", 10,
     "blurb", _("Horizontal offset (from origin) for start of grid"),
+    "unit", "pixel-coordinate",
+    "axis", "x",
     NULL)
 
 gegl_property_int (
@@ -59,6 +65,8 @@ gegl_property_int (
     "ui-min", -10,
     "ui-max",  10,
     "blurb", _("Vertical offset (from origin) for start of grid"),
+    "unit", "pixel-coordinate",
+    "axis", "y",
     NULL)
 
 gegl_property_color (
@@ -66,6 +74,7 @@ gegl_property_color (
     "nick", _("Color"),
     "default", "black",
     "blurb", _("One of the cell colors (defaults to 'black')"),
+    "role", "foreground",
     NULL)
 
 gegl_property_color (
@@ -73,6 +82,7 @@ gegl_property_color (
     "nick",  _("Color"),
     "default", "white",
     "blurb", _("One of the cell colors (defaults to 'white')"),
+    "role", "background",
     NULL)
 
 gegl_property_format (