Adding licenses to a with[out]-waterfall-parallelism.lisp.

Fixes #267
Synched up doc.lisp.
Reworking git quickstart guides.
Adding a closing </p> tag
Fixing a typo
Update build-single.sh
Merge pull request #274 from ragerdl/beta

Beta
Build system: add --pcert-all option for cert.pl/critpath.pl,
Xdoc: change some macros to do more of their work inside functions, to
reduce the amount of translation necessary.
VL: Updates toward supporting structs/unions/arrays.
 - Datatypes and vardecls are modified to reflect SV notion that each
   variable can have a nettype (or not) and datatype basically
   orthogonally
 - Improved parser support for datatypes and variable decls involving
   datatypes
 - Added (in hid-tools.lisp) routines for looking up types of hierarchical
   names such as struct/array accessors as well as HIDs
 - Added some support for structs/unions in expr-size
starting on array support
Merge branch 'master' of https://github.com/ragerdl/acl2
Lowering max mem for doc/top.lisp
Merge remote-tracking branch 'remotes/origin/beta'
Merge pull request #276 from ragerdl/master

License and doc/top.lisp memory adjustment
Adding value-triple reference to
gc-dollar-sign :doc topic
Merge pull request #277 from ragerdl/master

Adding value-triple reference to gc-dollar-sign :doc topic
VL: improve support for array indexes in sizing transform
Merge remote-tracking branch 'remotes/origin/master' into array
Merge branch 'array'
Added multi-threading support for memoization.  64-bit SBCL images have larger --dynamic-space-size.

  Support for multi-threading has been added for memoization. Thanks to
  Jared Davis for contributing an initial implementation. Note that
  this may slow down ACL2(hp) by several percent on
  memoization-intensive applications. Undocumented function
  mf-multiprocessing is available for low-level system hackers to
  turn on/off this feature, which by default is off for ACL2(h) and
  on for ACL2(hp).

64-bit SBCL-based ACL2 images are now saved with --dynamic-space-size
16000, not only for ACL2(h) but also for ACL2.  Thanks to Jared Davis
for bringing this issue to our attention.  I was able to get through
an ACL2(h) regression on my 8GB Mac laptop without problem (a few
unrelated failures but I'll deal with that another time), so I think
this is OK.