Tried to clean up comments a bit, following Drupal comment standards
more phpdoc comment cleanup
Merge pull request #2548 from rcsheets/doc_improvements

Misc documentation improvements in CRM/Utils/System.php
CRM-13992 coding neccessary property values / configurable options required for tab table layout orientation
CRM-13992 : handling multi-custom data listing, edit, add, view actions. reused profile code for listing and extended custom data engine for multi-value custom handling
CRM-13992 : custom data single record view handling, DELETE action handling, QA checks and fixes