a series of updates to the mako-mem template

a series of updates to the mako-mem template

- Padded right/left margins to decrease line length based on research into
  general typographic standards.
- Shrunk linespacing to decrease line-spacing to bring this in line with
  general typographic standards.
- Added comments explaining the changes and basic typographic decisions.
- Renamed some variables to make it more clear about the relationships between
  pagestyles.
- Added the vc-git and vc-awk scripts into the repository so folks don't have
  to go hunting for them.
- Made VC stuff generated by default in Makefile.
- Increased the amount of sample text so we can actually see the effects on
  full pages of text.