Merge branch 'RefactorPrint'

- Modifies printing model to be similar to glabels-3.x.
   - Allow simple projects to print by-the-page (#51)
   - Added collated vs uncollated document merges
- Added ability to separate merge groups by page
- Updated man pages
- Updated misc developer documentation

glabels/icons/flat/32x32/glabels-uncollated.svg

@@ -0,0 +1,19 @@
+<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="32" height="32" >
+
+  <rect
+     style="fill:#ffffff;fill-opacity:1;stroke:#333333;stroke-width:1;stroke-opacity:1"
+     height="8" width="20" x="2.5" y="7.5" rx="1" ry="1" />
+  <rect
+     style="fill:#ffffff;fill-opacity:1;stroke:#333333;stroke-width:1;stroke-opacity:1"
+     height="8" width="20" x="4.5" y="9.5" rx="1" ry="1" />
+  <rect
+     style="fill:#ffffff;fill-opacity:1;stroke:#333333;stroke-width:1;stroke-opacity:1"
+     height="8" width="20" x="6.5" y="11.5" rx="1" ry="1" />
+  <rect
+     style="fill:#ffffff;fill-opacity:1;stroke:#333333;stroke-width:1;stroke-opacity:1"
+     height="8" width="20" x="8.5" y="13.5" rx="1" ry="1" />
+  <rect
+     style="fill:#ffffff;fill-opacity:1;stroke:#333333;stroke-width:1;stroke-opacity:1"
+     height="8" width="20" x="10.5" y="15.5" rx="1" ry="1" />
+
+</svg>