Support inheritable project specific plugin parameters in the UI

The UI now also displays the inherited value.

Change-Id: I2ec034f919f31afc5687f9da6cbbe05f878d98c1
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/Documentation/rest-api-projects.txt b/Documentation/rest-api-projects.txt
index 48ef56a..9bfbd4d 100644
--- a/Documentation/rest-api-projects.txt
+++ b/Documentation/rest-api-projects.txt
@@ -1298,9 +1298,21 @@
 The type of the configuration parameter, can be `STRING`, `INT`,
 `LONG`, `BOOLEAN` or `LIST`.
 |`value`           |optional|
-The value of the configuration parameter as string.
+The value of the configuration parameter as string. If the parameter
+is inheritable this is the effective value which is deduced from
+`configured_value` and `inherited_value`.
 |`permitted_values`|optional|
 The list of permitted values, only set if the `type` is `LIST`.
+|`inheritable`     |`false` if not set|
+Whether the configuration parameter can be inherited.
+|`configured_value`|optional|
+The value of the configuration parameter that is configured on this
+project, only set if `inheritable` is true.
+|`inherited_value` |optional|
+The inherited value of the configuration parameter, only set if
+`inheritable` is true.
+|`permitted_values` |optional|
+The list of permitted values, only set if the `type` is `LIST`.
 |===============================
 
 [[dashboard-info]]