Merge pull request #775 from adamarla/master

Added codex
1/l6h part 1
Merge pull request #776 from abhinavc/master

1/l6h part 1
1/l6h part 2
Merge pull request #777 from abhinavc/master

1/l6h part 2
1/l6h part 3
Merge pull request #778 from abhinavc/master

1/l6h part 3
1/l6h part 4
Merge pull request #779 from abhinavc/master

1/l6h part 4
Symmetrical commands for making mobile.* pngs

Apply the same fuzzy factor
Merge pull request #780 from abhinavc/master

Symmetrical commands for generating mobile*.png
Margin figures moved to below question text

.. some more still need to be done
Merge pull request #781 from abhinavc/master

Margin figures brought below part 1
Versioning and figures below part 2
Merge pull request #782 from abhinavc/master

Margins below part 2
Figures below part 3
Merge pull request #783 from abhinavc/master

Figures below part 3
Preferring PNGs over JPEGs ...

Hoping to get crisper images for the mobile phone by switching to PNGs.
vault.mk and compile.sh are now slimmer / simpler.

mobile.black.png will be re-generated. Surprisingly, file size was
larger with transparent background. Hence, not making png transparent.

None of the old files will be touched. Only new ones generated.
mobile.black.png will be re-generated.
Merge pull request #784 from abhinavc/master

Preferring PNGs over JPEGs
1/m1h part 1