Remove codex.cdx before every re-compilation ...

The file should be created afresh everytime \begin{codex}..\end{codex}
is executed.
Merge pull request #796 from abhinavc/master

Create codex.cdx afresh with every recompilation
Shave the sides off pg-*.png

The narrower this image, the better it will render on a mobile device.
And mobile takes precedence over the web-site
Merge pull request #797 from abhinavc/master

Shave sides off pg-*.png
 1/q6h part 1
Merge pull request #798 from abhinavc/master

1/q6h part 1
1/q6h part 2
Merge pull request #799 from abhinavc/master

1/q6h part 2
1/qdh part 1
Merge pull request #800 from abhinavc/master

1/qdh part 1
1/qdh part 2
Merge pull request #801 from abhinavc/master

1/qdh part 2
Slight edit to \begin{calcaid} definition
minor syntactical error
Merge pull request #802 from abhinavc/master

Minor corrections
1/qyg part 1
Merge pull request #803 from abhinavc/master

1/qyg part 1
edited question and solution
Merge pull request #804 from abhinavc/master

Edited 2/zyg/hco8i
Made the question a tad more precise