Expose a new beforeUse callback on WorkspaceListener for performing actions on a workspace before it's used by a build.

Expose a new beforeUse callback on WorkspaceListener for performing actions on a workspace before it's used by a build.

[FIX JENKINS-10536] Package Groovy DSL descriptor for eclipse in core jar to ease creation of groovy views in eclipse

Fix prematurely re-drawing graph for matrix build.

I still don't fully understand why the right border gets cropped, but
playing with DOM manipulation window, it seems like the cell-level
"border-right: none" is winning over the table level "border: 1px solid
talks about the border conflict resolution specified in
http://www.w3.org/TR/CSS2/tables.html#border-conflict-resolution

What this fix does is to set the cell-level right border for pane
tables. I realize that this might break table nesting inside another
table.

CLOUDBEES-2124.

configurations in the matrix.

instead of the default HTML table look. Also moving the
"Configuration Matrix" title as a part of the table, to gain some space.

- doc update