Fix more documentation instructions

* InstallCache:
  Mention that it should apply for Cache 2013, the latest version that are available
  for download.
  Add a link to Nancy's original installation guide for Cache 5.2.
  Formating whole documentation to limit max character per line to be 80.
  Also more figure link to second line for easy diffing.
* ObtainingVistAMCode:
  Fix syntax error when formatting Mumps code line
  Also add a section for ZU routine as suggested
  Added link to ZU and ZUONT routine.
* ObtainingandInstallAuxPrograms:
  For python, explicitly mention the version requirement
  Add a section for window platform.
  Formating whole documentation to limit max character per line to be 80.
  Introduce VistATestClient interface.
* PrepareMComponents:
  Explicit mention the actually python script is from VistA repository.

Change-Id: I29cd917cbe96df2f4cae15399965c282e203bb77