replaced hardwired copyright year with date range

refs RM ticket 3230
Merge pull request #87 from ilios/rb2.2

replaced hardwired copyright year with date range
cleaned the script's header-comments.
Merge pull request #88 from ilios/rb2.2

cleaned the script's header-comments.
added post-install instructions

refs RM ticket 3160
linked to troubleshooting wiki entry
Merge pull request #89 from ilios/rb2.2

added post-install instructions
updated version number